Index: menu_helper.php
===================================================================
--- menu_helper.php	(revision 13756)
+++ menu_helper.php	(working copy)
@@ -148,7 +148,8 @@
 						$this->Application->setCache('master:cms_menu', serialize($menu));
 					}
 					else {
-						$this->Application->setDBCache('cms_menu', serialize($menu));
+						$to_cache = serialize($menu); // setDBCache's 2nd parameter passed by reference!
+						$this->Application->setDBCache('cms_menu', $to_cache);
 					}
 				}