Imported From: http://groups.google.com/group/in-portal-bugs/browse_thread/thread/e277901c41c1ff52#
There was some changes in Memcached server 1.4.5, resulting 2nd optional
parameter of "delete" function called "$expiration" became required. That
parameter is however not required based on it's documentation on
www.php.netwebsite. Because of that we can't delete keys we can get
some outdated
cached data as a result.
...
http://www.in-portal.com
http://www.alex-time.com
memcache_unix_socket_support.patch
memcache_delete_doesnt_work_on_latest_version_of_memcache.patch