Help me please!

[nicolerork]

Here's the scenerio -

I was hosting my vBulletin board on my personal website - www.nicolerork.com/sufjan

I recently purchased a new domain name and space for the board - www.sufjanfans.com

I backed up my database on nicolerork.com, did a fresh new install on sufjanfans.com and loaded the backed up database via phpmyadmin

Everything seems to be running alright except for the fact that I can't log in or stay logged in! Any help would be appreciated, I've got about 1,500 impatient members waiting for the boards to go back up...

Thanks for your help!