Admin Logon Loops

[apursell]

I enter correct username / password, it doesn't tell me its wrong, but boots me back to logon. SSL is off. PHP 5.2, Zen cart 1.3.6

Any suggestions, also sessions are set to DB, and the DB username/pass is correct. This is a FRESH install

Also overwrote all /admin files, and when i try to logon, with a bad password, it does tell me that the username/password is incorrect. But when using right credentials, it just loops.