--- block_refresh.module.orig	2008-02-19 13:00:39.000000000 +0100
+++ block_refresh.module	2008-02-19 13:01:21.000000000 +0100
@@ -74,7 +74,7 @@ function block_refresh_menu($may_cache) 
  *  displays the block content, without any other page information
  */
 function block_refresh_block_content($block = NULL, $delta = NULL) {
-  if (!isset($block) || !isset($delta) || !module_implements($block, 'block')) {  
+  if (!isset($block) && !isset($delta) && !module_implements($block, 'block')) {  
     drupal_not_found();
   }
   $settings = variable_get('block_refresh_settings', array());