ci sessions user_data disappears

[eluser]WanWizard[/eluser]
Your user_agent field is to small. CI 2.0.2 needs 120 characters. Your UA check probably fails after which the session is destroyed.

And note that you can not use 'localhost' for the cookie_domain, it's not accepted by Chrome. Leaving it empty isn't a goiod idea either. Better extract the hostname from the URI and use that, of configure it manually (for localhost, use 127.0.0.1).