디버깅 메시지를 출력하니 로그인할 때 /login 페이지에서 아래와 같은 내용이 나옵니다.

MemcachePool::set() [memcachepool.set]: The lowest two bytes of the flags array is reserved for pecl/memcache internal use(2)
File: /home/tc/framework/legacy/Textcube.Control.Session.Memcached.php:69

MemcachePool::set() [memcachepool.set]: The lowest two bytes of the flags array is reserved for pecl/memcache internal use(2)
File: /home/tc/framework/legacy/Textcube.Control.Session.Memcached.php:143

...

Current Database Management System :

MySQL
Cache system :

    * Page cache Enabled
    * Skin cache Enabled
    * Memcached module Enabled

MemcachePool::set() [memcachepool.set]: The lowest two bytes of the flags array is reserved for pecl/memcache internal use(2)
File: /home/tc/framework/legacy/Textcube.Control.Session.Memcached.php:45

리눅스 배포판은 gentoo, php 버전은 5.2.12, memcached는 1.4.1, pecl-memcache는 3.0.4, pecl-memcached는 1.0.0을 설치하였습니다.

도움 부탁 드립니다.