You enter your user name and password, and click login, it redirects you to the page that says "Thank you for logging in user X" Then it redirects you to the main page and you aren't logged in.

PHP_debug shows nothing weird in php code going on.

Something of note, When I turn SQL debugging on, no pop up windows opens showing the SQL call, so I wonder if there is a problem with the SQL call in user.php.

How do I get it back to allowing users to log in and actually be logged in?

please do a search for 'firewall' and 'HTTP_REFERRER', you'll find gazillion references to this issue

Herko