• When using single site installation, empty $table prefix and WP_CACHE_KEY_SALT, method key of cache object gives results like this: WP_CACHE_KEY_SALTuserlogins:admin – there’s a colon missing between WP_CACHE_KEY_SALT and group name. I’ve added a quickfix in key method after checking if global group like this:

    if(WP_CACHE_KEY_SALT != '' && $prefix == '')
    {
    $prefix = ':';
    }

    http://wordpress.org/extend/plugins/memcached/

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