--- C:/Users/Gonzalez/AppData/Local/Temp/taxonomy.php-rev1.svn000.tmp.php	mié oct 29 21:32:08 2014
+++ C:/Users/Gonzalez/Desktop/wp-core/wp-to-patch/wp-includes/taxonomy.php	mié oct 29 21:38:45 2014
@@ -410,7 +410,8 @@ function register_taxonomy( $taxonomy, $object_typ
 	$args['label'] = $args['labels']->name;
 
 	// If not set, use the default meta box
-	if ( null === $args['meta_box_cb'] ) {
+	// Avoid the wrong function if added manually
+	if ( null === $args['meta_box_cb'] || $args['meta_box_cb'] == 'post_categories_meta_box' || $args['meta_box_cb'] == 'post_tags_meta_box' ) {
 		if ( $args['hierarchical'] )
 			$args['meta_box_cb'] = 'post_categories_meta_box';
 		else