Index: wp-admin/admin-ajax.php
===================================================================
--- wp-admin/admin-ajax.php	(revision 15528)
+++ wp-admin/admin-ajax.php	(working copy)
@@ -1408,9 +1408,6 @@
 		die();
 	}
 
-	if ( !empty($_POST['add_new']) )
-		die();
-
 	if ( $form = $wp_registered_widget_controls[$widget_id] )
 		call_user_func_array( $form['callback'], $form['params'] );