Index: branches/RC/core/units/general/cat_tag_processor.php
===================================================================
diff -u -r11093 -r11149
--- branches/RC/core/units/general/cat_tag_processor.php	(.../cat_tag_processor.php)	(revision 11093)
+++ branches/RC/core/units/general/cat_tag_processor.php	(.../cat_tag_processor.php)	(revision 11149)
@@ -149,9 +149,12 @@
 				$params['prefix'] .= $prefix_append;
 			}
 
+			$default_grid = array_key_exists('default_grid', $params) ? $params['default_grid'] : 'Default';
+			$radio_grid = array_key_exists('radio_grid', $params) ? $params['radio_grid'] : 'Radio';
+
 			$params['cat_prefix'] = trim('c.'.($tab_params['special'] ? $tab_params['special'] : $this->Special), '.');
 			$params['tab_mode'] = $tab_params['mode'];
-			$params['grid_name'] = ($tab_params['mode'] == 'multi') ? $params['default_grid'] : $params['radio_grid'];
+			$params['grid_name'] = ($tab_params['mode'] == 'multi') ? $default_grid : $radio_grid;
 			$params['tab_dependant'] = $tab_params['dependant'];
 			$params['show_category'] = $tab_params['special'] == 'showall' ? 1 : 0; // this is advanced view -> show category name