Index: branches/unlabeled/unlabeled-1.4.2/core/units/general/helpers/search_helper.php
===================================================================
diff -u -r6907 -r7015
--- branches/unlabeled/unlabeled-1.4.2/core/units/general/helpers/search_helper.php	(.../search_helper.php)	(revision 6907)
+++ branches/unlabeled/unlabeled-1.4.2/core/units/general/helpers/search_helper.php	(.../search_helper.php)	(revision 7015)
@@ -306,7 +306,7 @@
 				if ($submit_filters) {
 					foreach ($submit_filters as $field_name => $field_options) {
 						list ($filter_type, $field_value) = each($field_options);
-						$is_empty = is_array($field_value) ? !implode('', $field_value) : !$field_value;
+						$is_empty = strlen(is_array($field_value) ? implode('', $field_value) : $field_value) == 0;
 						if ($is_empty) {
 							if (isset($custom_filter[$field_name])) {
 								// use isset, because non-existing key will cause "php notice"!
@@ -364,7 +364,7 @@
 		 */
 		function getRangeValue($value)
 		{
-			return $value && is_numeric($value) ? $this->Conn->qstr($value) : false;
+			return strlen($value) && is_numeric($value) ? $this->Conn->qstr($value) : false;
 		}
 		
 		function getCustomFilterSearchClause(&$object, $field_name, $filter_type, $field_options)
@@ -437,7 +437,7 @@
 				
 				case 'equals':
 				case 'options':	
-					$field_value = $field_options['submit_value'] ? $this->Conn->qstr($field_options['submit_value']) : false;
+					$field_value = strlen($field_options['submit_value']) ? $this->Conn->qstr($field_options['submit_value']) : false;
 					if ($field_value) {
 						$filter_value = $table_name.'`'.$field_name.'` = '.$field_value;
 					}
@@ -467,7 +467,7 @@
 		 */
 		function processRangeField(&$object, $search_field, $value, $type)
 		{
-			if (!$value[$type]) {
+			if (strlen($value[$type]) > 0) {
 				return false;
 			}