Index: branches/unlabeled/unlabeled-1.108.2/globals.php
===================================================================
diff -u -r5718 -r5796
--- branches/unlabeled/unlabeled-1.108.2/globals.php	(.../globals.php)	(revision 5718)
+++ branches/unlabeled/unlabeled-1.108.2/globals.php	(.../globals.php)	(revision 5796)
@@ -2025,8 +2025,15 @@
         for ($i = 0; $i < $CustomFields->NumItems(); $i++) {
 			$objField =& $CustomFields->GetItemRefByIndex($i);
 			$field_name = $objField->Get('FieldName');
-
+			$element_type = $objField->Get('ElementType');
+			
 			$value = getCustomValue($field_name);
+
+			if ($element_type == 'checkbox' && $value === false) {
+				// unchecked checkboxes are not submitted
+				$value = 0;
+			}
+			
 			if ($value !== false) {
 				$objCustomEdit->SetFieldValue($objField->Get('CustomFieldId'), $resource_id, $value);
 				$data_changed = true;