Session lost on ci 1.7.2

[eluser]siubie[/eluser]
im still on ci session not change to native session yet but so far code from wandwizard is going fine

here is my config for session

Code:

$config['sess_cookie_name']        = 'cisession';
$config['sess_expiration']        = 7200;
$config['sess_encrypt_cookie']    = FALSE;
$config['sess_use_database']    = TRUE;
$config['sess_table_name']        = 'ci_sessions';
$config['sess_match_ip']        = FALSE;
$config['sess_match_useragent']    = TRUE;
$config['sess_time_to_update']     = 300;

$config['cookie_prefix']    = "";
$config['cookie_domain']    = "";
$config['cookie_path']        = "/";