Switched to PHP5 and CI Broke, Please help!

[eluser]WanWizard[/eluser]
There's a lot missing from that.

Don't use localhost, but a proper host name. Remove any underscores from the cookie name (default is ci_session, rename it). Configure the sess_* variables in your config file so that you use database sessions (check the user guide and the ion auth instructions). Make sure the cookie_* config values are configured properly. the hostname should match the hostname of your site, the path should be "/", unless you installed CI in a subdirectory.