Sessions - Not Working

You are wrong about loading the session as a driver.
Just like before, it must be loaded as a library:

PHP Code:

$this->load->library('session'); 


Check the documentation for that.

The tricky part is configuring the session settings.
I didn't get it working with $config['sess_driver'] = 'files';
Therefore, I switched to $config['sess_driver'] = 'database';  and I added a ci_sessions table to my database.
No problems with sessions since then.