--- bootstrap.inc.orig	2010-12-15 20:21:14.000000000 +0700
+++ bootstrap.inc	2011-01-01 10:05:30.000000000 +0700
@@ -658,7 +658,8 @@ function page_get_cache($status_only = F
   $cache = NULL;
 
   if (!$user->uid && $_SERVER['REQUEST_METHOD'] == 'GET' && count(drupal_set_message()) == 0 && $_SERVER['SERVER_SOFTWARE'] !== 'PHP CLI') {
-    $cache = cache_get($base_root . request_uri(), 'cache_page');
+    //$cache = cache_get($base_root . request_uri(), 'cache_page');
+    $cache = cache_get($base_root . urldecode(request_uri()), 'cache_page');
 
     if (empty($cache)) {
       ob_start();