Caching problem

I have strange problems when i use memcached. Most of settings stops working, changes are not getting saved. All problems disappearing when i disable plugin. Similar topic:
http://wordpress.org/support/topic/plugin-memcached-object-cache-problem-editing-posts

My server program versions:

pecl-memcache version:

Name        : php54-pecl-memcache
Arch        : x86_64
Version     : 3.0.7
Release     : 2.ius.el6
Size        : 135 k
Repo        : installed
From repo   : ius
Summary     : Extension to work with the Memcached caching daemon
URL         : http://pecl.php.net/package/memcache

memcached version:

Name        : memcached
Arch        : x86_64
Version     : 1.4.4
Release     : 3.el6
Size        : 147 k
Repo        : installed
From repo   : base
Summary     : High Performance, Distributed Memory Object Cache
URL         : http://www.memcached.org/

php version:

Name        : php54
Arch        : x86_64
Version     : 5.4.11
Release     : 1.ius.el6
Size        : 9.1 M
Repo        : installed
From repo   : ius
Summary     : PHP scripting language for creating dynamic web sites
URL         : http://www.php.net/

How can i fix this?

site is: http://kremim.com/ if you want to check
http://wordpress.org/extend/plugins/memcached/