Index: branches/unlabeled/unlabeled-1.28.2/kernel/units/categories/categories_tag_processor.php
===================================================================
diff -u -r5795 -r5833
--- branches/unlabeled/unlabeled-1.28.2/kernel/units/categories/categories_tag_processor.php	(.../categories_tag_processor.php)	(revision 5795)
+++ branches/unlabeled/unlabeled-1.28.2/kernel/units/categories/categories_tag_processor.php	(.../categories_tag_processor.php)	(revision 5833)
@@ -490,7 +490,7 @@
 		elseif ($tab_prefixes != 'all') {
 			// prefix list here
 			$tab_prefixes = explode(',', $tab_prefixes); // list of prefixes that should stay
-			$skip_prefixes = array_diff($prefixes, $tab_prefixes);
+			$skip_prefixes = array_unique(array_merge($skip_prefixes, array_diff($prefixes, $tab_prefixes)));
 		}
 		
 		$params['name'] = $params['render_as'];