PLEASE HELP! AGB2.3.1

Help me please!!!!

I upgraded AGB from 2.2 to 2.3.1, I uploaded the new gb folder, upgraded the DB as per instructions and it works fine from the guests point of view.

However, when I try to administer it, it keeps saying my password is invalid! This happened before when I tried to upgrade. I deleted all my cookies and temp files but no luck. I did save the old gb folder (renamed it) so is there a file I need to copy over with my password details so that it will work again.

Please help!!!

OK, my old user name and password lets me into the control panel ok, but when I go to access any of the CP options (general settings, easy admin, templates etc.) then it brings me back to the user name and password login screen again.

HELP!!!!!!