CodeIgniter lost my session

[eluser]tkyy[/eluser]
try changing your cookie prefix around, sometimes codeigniter has problems with specific cookie names. he means that the time on your server is updated and proper so that the cookie doesnt destroy itself as it creates itself.

also try turning off useragent and ip matching (although this will leave you vulnerable to cookie stealing xss if your application is going to be widely used, if it is something for client and private use don't worry about it though) as sometimes this causes the session to explode in odd situations.