Ticket #13359: 13359.patch

wp-admin/includes/nav-menu.php

@@ -334 +334 @@
 function wp_initial_nav_menu_meta_boxes() {
         global $wp_meta_boxes;
 
-        if ( get_user_option( 'metaboxhidden_nav-menus' ) || ! is_array($wp_meta_boxes) )
+        if ( get_user_option( 'metaboxhidden_nav-menus' ) !== false || ! is_array($wp_meta_boxes) )
                 return;
 
         $initial_meta_boxes = array( 'manage-menu', 'create-menu', 'add-custom-links', 'add-page', 'add-category' );