diff --git a/backend/2of5.c b/backend/2of5.c
index dd405986..07c17a25 100644
--- a/backend/2of5.c
+++ b/backend/2of5.c
@@ -171,12 +171,15 @@ int interleaved_two_of_five(struct zint_symbol *symbol, unsigned char source[],
 
 	int i, j, k, error_number;
 	char bars[7], spaces[7], mixed[14], dest[1000];
-	unsigned char *temp = source;
-	unsigned int temp_len = length;
+#ifndef _MSC_VER
+	unsigned char temp[length + 2];
+#else
+	unsigned char* temp = (unsigned char *)_alloca((length + 2) * sizeof(unsigned char));
+#endif
 
 	error_number = 0;
 	
-	if(length > 90) {
+	if(length > 89) {
 		strcpy(symbol->errtxt, "Input too long");
 		return ERROR_TOO_LONG;
 	}
@@ -186,24 +189,20 @@ int interleaved_two_of_five(struct zint_symbol *symbol, unsigned char source[],
 		return error_number;
 	}
 	
+	ustrcpy(temp, (unsigned char *) "");
 	/* Input must be an even number of characters for Interlaced 2 of 5 to work:
 	   if an odd number of characters has been entered then add a leading zero */
 	if ((length % 2) != 0)
 	{
-		/* there are an odd number of input characters */
-		if (NULL == (temp = (unsigned char*)malloc(++temp_len)))
-		{
-			strcpy(symbol->errtxt, "Memory allocation failed");
-			return ERROR_MEMORY;
-		}
-		temp[0] = '0';
-		ustrcpy(temp + 1, source);
+		ustrcpy(temp, (unsigned char *) "0");
+		length++;
 	}
+	uconcat(temp, source);
 
 	/* start character */
 	strcpy(dest, "1111");
 
-	for(i = 0; i < temp_len; i+=2 )
+	for(i = 0; i < length; i+=2 )
 	{
 		/* look up the bars and the spaces and put them in two strings */
 		strcpy(bars, "");
@@ -227,8 +226,6 @@ int interleaved_two_of_five(struct zint_symbol *symbol, unsigned char source[],
 	
 	expand(symbol, dest);
 	ustrcpy(symbol->text, temp);
-	if (temp != source)
-		free(source);
 	return error_number;
 
 }
diff --git a/backend/dm200.c b/backend/dm200.c
index df98d5a7..0d703906 100644
--- a/backend/dm200.c
+++ b/backend/dm200.c
@@ -786,35 +786,33 @@ int data_matrix_200(struct zint_symbol *symbol, unsigned char source[], int leng
 		optionsize = -1;
 	}
 	
-	calcsize = 0;
-	for(i = 0; i < 30; i++) {
-		if(matrixbytes[i] < binlen) {
+	calcsize = 29;
+	for(i = 29; i > -1; i--) {
+		if(matrixbytes[i] > binlen) {
 			calcsize = i;
 		}
 	}
-	calcsize++;
-
-	if(calcsize <= optionsize) {
-		symbolsize = optionsize;
-	} else {
-		symbolsize = calcsize;
-		if(optionsize != -1) {
-			/* flag an error */
-			error_number = WARN_INVALID_OPTION;
-			strcpy(symbol->errtxt, "Data does not fit in selected symbol size");
-		}
-	}
 
 	if(symbol->option_3 == DM_SQUARE) {
 		/* Force to use square symbol */
-		switch(symbolsize) {
+		switch(calcsize) {
 			case 2:
 			case 4:
 			case 6:
 			case 9:
 			case 11:
 			case 14:
-				symbolsize++;
+				calcsize++;
+		}
+	}
+	
+	symbolsize = optionsize;
+	if(calcsize > optionsize) {
+		symbolsize = calcsize;
+		if(optionsize != -1) {
+			/* flag an error */
+			error_number = WARN_INVALID_OPTION;
+			strcpy(symbol->errtxt, "Data does not fit in selected symbol size");
 		}
 	}
 	
diff --git a/backend/gridmtx.c b/backend/gridmtx.c
index a6a11542..6cfd1db1 100644
--- a/backend/gridmtx.c
+++ b/backend/gridmtx.c
@@ -907,7 +907,7 @@ int grid_matrix(struct zint_symbol *symbol, unsigned char source[], int length)
 	int auto_layers, min_layers, layers, auto_ecc_level, min_ecc_level, ecc_level;
 	int x, y, i, j, glyph;
 	char binary[9300];
-	int data_cw;
+	int data_cw, input_latch = 0;
 	int word[1460], data_max;
 	
 #ifndef _MSC_VER
@@ -972,9 +972,17 @@ int grid_matrix(struct zint_symbol *symbol, unsigned char source[], int length)
 	for(i = 12; i > 0; i--) {
 		if(gm_max_cw[(i - 1)] >= data_cw) { min_layers = i; }
 	}
-	
 	layers = auto_layers;
+	auto_ecc_level = 3;
+	if(layers == 1) { auto_ecc_level = 5; }
+	if((layers == 2) || (layers == 3)) { auto_ecc_level = 4; }
+	min_ecc_level = 1;
+	if(layers == 1) { min_ecc_level = 4; }
+	if((layers == 2) || (layers == 3)) { min_ecc_level = 2; }
+	ecc_level = auto_ecc_level;
+	
 	if((symbol->option_2 >= 1) && (symbol->option_2 <= 13)) {
+		input_latch = 1;
 		if(symbol->option_2 > min_layers) {
 			layers = symbol->option_2;
 		} else {
@@ -982,19 +990,28 @@ int grid_matrix(struct zint_symbol *symbol, unsigned char source[], int length)
 		}
 	}
 	
-	auto_ecc_level = 3;
-	if(layers == 1) { auto_ecc_level = 5; }
-	if((layers == 2) || (layers == 3)) { auto_ecc_level = 4; }
-	min_ecc_level = 1;
-	if(layers == 1) { min_ecc_level = 4; }
-	if((layers == 2) || (layers == 3)) { min_ecc_level = 2; }
+	if(input_latch == 1) {
+		auto_ecc_level = 3;
+		if(layers == 1) { auto_ecc_level = 5; }
+		if((layers == 2) || (layers == 3)) { auto_ecc_level = 4; }
+		ecc_level = auto_ecc_level;
+		if(data_cw > gm_data_codewords[(5 * (layers - 1)) + (ecc_level - 1)]) {
+			layers++;
+		}
+	}
 	
-	ecc_level = auto_ecc_level;
-	if((symbol->option_1 >= 1) && (symbol->option_1 <= 5)) {
-		if(symbol->option_1 > min_ecc_level) {
-			ecc_level = symbol->option_1;
-		} else {
-			ecc_level = min_ecc_level;
+	if(input_latch == 0) {
+		if((symbol->option_1 >= 1) && (symbol->option_1 <= 5)) {
+			if(symbol->option_1 > min_ecc_level) {
+				ecc_level = symbol->option_1;
+			} else {
+				ecc_level = min_ecc_level;
+			}
+		}
+		if(data_cw > gm_data_codewords[(5 * (layers - 1)) + (ecc_level - 1)]) {
+			do {
+				layers++;
+			} while ((data_cw > gm_data_codewords[(5 * (layers - 1)) + (ecc_level - 1)]) && (layers <= 13));
 		}
 	}
 	
diff --git a/backend/qr.c b/backend/qr.c
index 332cbc31..3e0672a4 100644
--- a/backend/qr.c
+++ b/backend/qr.c
@@ -57,7 +57,7 @@ int in_alpha(int glyph) {
 	return retval;
 }
 
-void define_mode(char mode[], int jisdata[], int length)
+void define_mode(char mode[], int jisdata[], int length, int gs1)
 {
 	/* Values placed into mode[] are: K = Kanji, B = Binary, A = Alphanumeric, N = Numeric */
 	int i, mlen, j;
@@ -68,6 +68,7 @@ void define_mode(char mode[], int jisdata[], int length)
 		} else {
 			mode[i] = 'B';
 			if(in_alpha(jisdata[i])) { mode[i] = 'A'; }
+			if(gs1 && (jisdata[i] == '[')) { mode[i] = 'A'; }
 			if((jisdata[i] >= '0') && (jisdata[i] <= '9')) { mode[i] = 'N'; }
 		}
 	}
@@ -348,14 +349,65 @@ void qr_binary(int datastream[], int version, int target_binlen, char mode[], in
 					int count;
 					int first = 0, second = 0, prod;
 			
-					first = posn(RHODIUM, (char) jisdata[position + i]);
-					count = 1;
-					prod = first;
-					
-					if(mode[position + i + 1] == 'A') {
-						second = posn(RHODIUM, (char) jisdata[position + i + 1]);
-						count = 2;
-						prod = (first * 45) + second;
+					if(percent == 0) {
+						if(gs1 && (jisdata[position + i] == '%')) {
+							first = posn(RHODIUM, '%');
+							second = posn(RHODIUM, '%');
+							count = 2;
+							prod = (first * 45) + second;
+							i++;
+						} else {
+							if(gs1 && (jisdata[position + i] == '[')) {
+								first = posn(RHODIUM, '%'); /* FNC1 */
+							} else {
+								first = posn(RHODIUM, (char) jisdata[position + i]);
+							}
+							count = 1;
+							i++;
+							prod = first;
+						
+							if(mode[position + i] == 'A') {
+								if(gs1 && (jisdata[position + i] == '%')) {
+									second = posn(RHODIUM, '%');
+									count = 2;
+									prod = (first * 45) + second;
+									percent = 1;
+								} else {
+									if(gs1 && (jisdata[position + i] == '[')) {
+										second = posn(RHODIUM, '%'); /* FNC1 */
+									} else {
+										second = posn(RHODIUM, (char) jisdata[position + i]);
+									}
+									count = 2;
+									i++;
+									prod = (first * 45) + second;
+								}
+							}
+						}
+					} else {
+						first = posn(RHODIUM, '%');
+						count = 1;
+						i++;
+						prod = first;
+						percent = 0;
+						
+						if(mode[position + i] == 'A') {
+							if(gs1 && (jisdata[position + i] == '%')) {
+								second = posn(RHODIUM, '%');
+								count = 2;
+								prod = (first * 45) + second;
+								percent = 1;
+							} else {
+								if(gs1 && (jisdata[position + i] == '[')) {
+									second = posn(RHODIUM, '%'); /* FNC1 */
+								} else {
+									second = posn(RHODIUM, (char) jisdata[position + i]);
+								}
+								count = 2;
+								i++;
+								prod = (first * 45) + second;
+							}
+						}
 					}
 
 					switch(count) {
@@ -376,8 +428,6 @@ void qr_binary(int datastream[], int version, int target_binlen, char mode[], in
 					}
 					
 					if(debug) { printf("0x%4X ", prod); }
-					
-					i += count;
 				};
 				
 				if(debug) { printf("\n"); }
@@ -1116,7 +1166,7 @@ int qr_code(struct zint_symbol *symbol, unsigned char source[], int length)
 			break;
 	}
 	
-	define_mode(mode, jisdata, length);
+	define_mode(mode, jisdata, length, gs1);
 	est_binlen = estimate_binary_length(mode, length, gs1);
 	
 	ecc_level = LEVEL_L;
@@ -1300,6 +1350,10 @@ int micro_qr_intermediate(char binary[], int jisdata[], char mode[], int length,
 					if(prod & 0x01) { concat(binary, "1"); } else { concat(binary, "0"); }
 					
 					if(debug) { printf("0x%4X ", prod); }
+					
+					if(strlen(binary) > 128) {
+						return ERROR_TOO_LONG;
+					}
 				}
 				
 				if(debug) { printf("\n"); }
@@ -1332,6 +1386,10 @@ int micro_qr_intermediate(char binary[], int jisdata[], char mode[], int length,
 					if(byte & 0x01) { concat(binary, "1"); } else { concat(binary, "0"); }
 					
 					if(debug) { printf("0x%4X ", byte); }
+					
+					if(strlen(binary) > 128) {
+						return ERROR_TOO_LONG;
+					}
 				}
 				
 				if(debug) { printf("\n"); }
@@ -1385,6 +1443,10 @@ int micro_qr_intermediate(char binary[], int jisdata[], char mode[], int length,
 					
 					if(debug) { printf("0x%4X ", prod); }
 					
+					if(strlen(binary) > 128) {
+						return ERROR_TOO_LONG;
+					}
+					
 					i += 2;
 				};
 				
@@ -1444,6 +1506,10 @@ int micro_qr_intermediate(char binary[], int jisdata[], char mode[], int length,
 					
 					if(debug) { printf("0x%4X (%d)", prod, prod); }
 					
+					if(strlen(binary) > 128) {
+						return ERROR_TOO_LONG;
+					}
+					
 					i += 3;
 				};
 				
@@ -2150,7 +2216,7 @@ int micro_apply_bitmask(unsigned char *grid, int size)
 int microqr(struct zint_symbol *symbol, unsigned char source[], int length)
 {
 	int i, j, glyph, size;
-	char binary_stream[130];
+	char binary_stream[200];
 	char full_stream[200];
 	int utfdata[40];
 	int jisdata[40];
@@ -2203,7 +2269,7 @@ int microqr(struct zint_symbol *symbol, unsigned char source[], int length)
 			break;
 	}
 	
-	define_mode(mode, jisdata, length);
+	define_mode(mode, jisdata, length, 0);
 	
 	n_count = 0;
 	a_count = 0;
diff --git a/frontend_qt4/grpDM.ui b/frontend_qt4/grpDM.ui
index 1424e380..c5203ccd 100644
--- a/frontend_qt4/grpDM.ui
+++ b/frontend_qt4/grpDM.ui
@@ -1,61 +1,62 @@
-<ui version="4.0" >
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
  <class>grpDM</class>
- <widget class="QWidget" name="grpDM" >
-  <property name="geometry" >
+ <widget class="QWidget" name="grpDM">
+  <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>398</width>
+    <width>410</width>
     <height>339</height>
    </rect>
   </property>
-  <property name="windowTitle" >
+  <property name="windowTitle">
    <string>Form</string>
   </property>
-  <layout class="QVBoxLayout" name="verticalLayout" >
+  <layout class="QVBoxLayout" name="verticalLayout">
    <item>
-    <layout class="QGridLayout" name="gridLayout_3" >
-     <item row="0" column="0" >
-      <layout class="QHBoxLayout" name="horizontalLayout" >
+    <layout class="QGridLayout" name="gridLayout_3">
+     <item row="0" column="0">
+      <layout class="QHBoxLayout" name="horizontalLayout">
        <item>
-        <widget class="QLabel" name="label" >
-         <property name="text" >
+        <widget class="QLabel" name="label">
+         <property name="text">
           <string>Encoding &amp;Mode:</string>
          </property>
-         <property name="buddy" >
+         <property name="buddy">
           <cstring>cmbDMMode</cstring>
          </property>
         </widget>
        </item>
        <item>
-        <widget class="QComboBox" name="cmbDMMode" >
+        <widget class="QComboBox" name="cmbDMMode">
          <item>
-          <property name="text" >
+          <property name="text">
            <string>ECC 200 (Recommended)</string>
           </property>
          </item>
          <item>
-          <property name="text" >
+          <property name="text">
            <string>ECC 000</string>
           </property>
          </item>
          <item>
-          <property name="text" >
+          <property name="text">
            <string>ECC 050</string>
           </property>
          </item>
          <item>
-          <property name="text" >
+          <property name="text">
            <string>ECC 080</string>
           </property>
          </item>
          <item>
-          <property name="text" >
+          <property name="text">
            <string>ECC 100</string>
           </property>
          </item>
          <item>
-          <property name="text" >
+          <property name="text">
            <string>ECC 140</string>
           </property>
          </item>
@@ -63,134 +64,134 @@
        </item>
       </layout>
      </item>
-     <item row="1" column="0" >
-      <widget class="QGroupBox" name="grpDMNon200" >
-       <property name="title" >
+     <item row="1" column="0">
+      <widget class="QGroupBox" name="grpDMNon200">
+       <property name="title">
         <string>Non ECC 200 Options</string>
        </property>
-       <layout class="QGridLayout" name="gridLayout_2" >
-        <item row="0" column="0" >
-         <widget class="QLabel" name="lblDMNon200Size" >
-          <property name="text" >
+       <layout class="QGridLayout" name="gridLayout_2">
+        <item row="0" column="0">
+         <widget class="QLabel" name="lblDMNon200Size">
+          <property name="text">
            <string>Si&amp;ze:</string>
           </property>
-          <property name="alignment" >
+          <property name="alignment">
            <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>
           </property>
-          <property name="buddy" >
+          <property name="buddy">
            <cstring>cmbDMNon200Size</cstring>
           </property>
          </widget>
         </item>
-        <item row="0" column="1" >
-         <widget class="QComboBox" name="cmbDMNon200Size" >
+        <item row="0" column="1">
+         <widget class="QComboBox" name="cmbDMNon200Size">
           <item>
-           <property name="text" >
+           <property name="text">
             <string>Automatic</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>9 x 9</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>11 x 11</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>13 x 13</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>15 x 15</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>17 x 17</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>19 x 19</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>21 x 21</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>23 x 23</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>25 x 25</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>27 x 27</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>29 x 29</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>31 x 31</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>33 x 33</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>35 x 35</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>37 x 37</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>39 x 39</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>41 x 41</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>43 x 43</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>45 x 45</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>47 x 47</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>49 x 49</string>
            </property>
           </item>
@@ -199,216 +200,226 @@
        </layout>
       </widget>
      </item>
-     <item row="2" column="0" >
-      <widget class="QGroupBox" name="grpDM200" >
-       <property name="title" >
+     <item row="2" column="0">
+      <widget class="QGroupBox" name="grpDM200">
+       <property name="title">
         <string>ECC 200 Options</string>
        </property>
-       <layout class="QGridLayout" name="gridLayout" >
-        <item row="0" column="0" >
-         <widget class="QRadioButton" name="radDM200Stand" >
-          <property name="text" >
+       <layout class="QGridLayout" name="gridLayout">
+        <item row="0" column="0">
+         <widget class="QRadioButton" name="radDM200Stand">
+          <property name="text">
            <string>S&amp;tandard</string>
           </property>
-          <property name="checked" >
+          <property name="checked">
            <bool>true</bool>
           </property>
          </widget>
         </item>
-        <item row="0" column="2" >
-         <widget class="QRadioButton" name="radDM200HIBC" >
-          <property name="text" >
+        <item row="0" column="2">
+         <widget class="QRadioButton" name="radDM200HIBC">
+          <property name="text">
            <string>&amp;HIBC Data Matrix</string>
           </property>
          </widget>
         </item>
-        <item row="1" column="0" colspan="2" >
-         <widget class="QRadioButton" name="radDM200GS1" >
-          <property name="text" >
+        <item row="1" column="0" colspan="2">
+         <widget class="QRadioButton" name="radDM200GS1">
+          <property name="text">
            <string>&amp;GS-1 Data Mode</string>
           </property>
          </widget>
         </item>
-        <item row="2" column="0" >
-         <widget class="QLabel" name="lblDM200Size" >
-          <property name="text" >
+        <item row="2" column="0">
+         <widget class="QLabel" name="lblDM200Size">
+          <property name="text">
            <string>Si&amp;ze:</string>
           </property>
-          <property name="buddy" >
+          <property name="buddy">
            <cstring>cmbDM200Size</cstring>
           </property>
          </widget>
         </item>
-        <item row="2" column="1" colspan="2" >
-         <widget class="QComboBox" name="cmbDM200Size" >
+        <item row="2" column="1" colspan="2">
+         <widget class="QComboBox" name="cmbDM200Size">
           <item>
-           <property name="text" >
+           <property name="text">
             <string>Automatic</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>10 x 10</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>12 x 12</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>14 x 14</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>16 x 16</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>18 x 18</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>20 x 20</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>22 x 22</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>24 x 24</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>26 x 26</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>32 x 32</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>36 x 36</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>40 x 40</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>44 x 44</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>48 x 48</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>52 x 52</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>64 x 64</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>72 x 72</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>80 x 80</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>88 x 88</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>96 x 96</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>104 x 104</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>120 x 120</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>132 x 132</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>144 x 144</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>8 x 18</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>8 x 32</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>12 x 26</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>12 x 36</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>16 x 36</string>
            </property>
           </item>
           <item>
-           <property name="text" >
+           <property name="text">
             <string>16 x 48</string>
            </property>
           </item>
          </widget>
         </item>
+        <item row="3" column="0" colspan="3">
+         <widget class="QCheckBox" name="chkDMRectangle">
+          <property name="text">
+           <string>Suppress Rectangular Symbols in Automatic Mode</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
        </layout>
       </widget>
      </item>
     </layout>
    </item>
    <item>
-    <spacer name="verticalSpacer" >
-     <property name="orientation" >
+    <spacer name="verticalSpacer">
+     <property name="orientation">
       <enum>Qt::Vertical</enum>
      </property>
-     <property name="sizeHint" stdset="0" >
+     <property name="sizeHint" stdset="0">
       <size>
        <width>20</width>
        <height>71</height>
diff --git a/frontend_qt4/mainwindow.cpp b/frontend_qt4/mainwindow.cpp
index 28e20aeb..ebffbc90 100644
--- a/frontend_qt4/mainwindow.cpp
+++ b/frontend_qt4/mainwindow.cpp
@@ -374,6 +374,7 @@ void MainWindow::change_options()
 		connect(m_optionWidget->findChild<QObject*>("radDM200HIBC"), SIGNAL(clicked( bool )), SLOT(update_preview()));
 		connect(m_optionWidget->findChild<QObject*>("cmbDM200Size"), SIGNAL(currentIndexChanged( int )), SLOT(update_preview()));
 		connect(m_optionWidget->findChild<QObject*>("cmbDMNon200Size"), SIGNAL(currentIndexChanged( int )), SLOT(update_preview()));
+		connect(m_optionWidget->findChild<QObject*>("chkDMRectangle"), SIGNAL(stateChanged( int )), SLOT(update_preview()));
 		datamatrix_options();
 	}
 
@@ -738,6 +739,10 @@ void MainWindow::update_preview()
 					m_bc.bc.setInputMode(GS1_MODE);
 
 				m_bc.bc.setWidth(m_optionWidget->findChild<QComboBox*>("cmbDM200Size")->currentIndex());
+				if(m_optionWidget->findChild<QCheckBox*>("chkDMRectangle")->isChecked())
+					m_bc.bc.setOption3(DM_SQUARE);
+				else
+					m_bc.bc.setOption3(0);
 			} 
 			else
 			{	/* Not ECC 200 */