Index: drupal7/misc/ajax.js
===================================================================
--- drupal7.orig/misc/ajax.js	2014-04-24 11:12:32.652571847 -0500
+++ drupal7/misc/ajax.js	2014-04-24 11:13:36.935967718 -0500
@@ -622,7 +622,7 @@
    * Command to update a form's build ID.
    */
   updateBuildId: function(ajax, response, status) {
-    $('input[name="form_build_id"][value="' + response.old + '"]').val(response.new);
+    $('input[name="form_build_id"][value="' + response['old'] + '"]').val(response['new']);
   }
 };
 
