diff -r f507feede89a -r 09a1c134465b web/wp-includes/class-wp-walker.php
--- a/web/wp-includes/class-wp-walker.php	Wed Dec 19 12:35:13 2012 -0800
+++ b/web/wp-includes/class-wp-walker.php	Wed Dec 19 17:46:52 2012 -0800
@@ -126,7 +126,7 @@
 		if ( is_array( $args[0] ) )
 			$args[0]['has_children'] = ! empty( $children_elements[$element->$id_field] );
 		$cb_args = array_merge( array(&$output, $element, $depth), $args);
-		call_user_func_array(array(&$this, 'start_el'), $cb_args);
+		call_user_func_array(array($this, 'start_el'), $cb_args);
 
 		$id = $element->$id_field;
 
@@ -139,7 +139,7 @@
 					$newlevel = true;
 					//start the child delimiter
 					$cb_args = array_merge( array(&$output, $depth), $args);
-					call_user_func_array(array(&$this, 'start_lvl'), $cb_args);
+					call_user_func_array(array($this, 'start_lvl'), $cb_args);
 				}
 				$this->display_element( $child, $children_elements, $max_depth, $depth + 1, $args, $output );
 			}
@@ -149,12 +149,12 @@
 		if ( isset($newlevel) && $newlevel ){
 			//end the child delimiter
 			$cb_args = array_merge( array(&$output, $depth), $args);
-			call_user_func_array(array(&$this, 'end_lvl'), $cb_args);
+			call_user_func_array(array($this, 'end_lvl'), $cb_args);
 		}
 
 		//end this element
 		$cb_args = array_merge( array(&$output, $element, $depth), $args);
-		call_user_func_array(array(&$this, 'end_el'), $cb_args);
+		call_user_func_array(array($this, 'end_el'), $cb_args);
 	}
 
 	/**