Index: C:/Xampp/htdocs/development/subversion/wordpress/wp-includes/template-functions-general.php
===================================================================
--- C:/Xampp/htdocs/development/subversion/wordpress/wp-includes/template-functions-general.php	(revision 3535)
+++ C:/Xampp/htdocs/development/subversion/wordpress/wp-includes/template-functions-general.php	(working copy)
@@ -232,7 +232,7 @@
 function single_cat_title($prefix = '', $display = true ) {
 	$cat = intval( get_query_var('cat') );
 	if ( !empty($cat) && !(strtoupper($cat) == 'ALL') ) {
-		$my_cat_name = get_the_category_by_ID($cat);
+		$my_cat_name = apply_filters('list_cats', get_the_category_by_ID($cat), $cat);
 		if ( !empty($my_cat_name) ) {
 			if ( $display )
 				echo $prefix.strip_tags($my_cat_name);