I had the same problem upgrading from 4.7h and found that the "Forum Cookie Prefix" didn't get set, I believe this may be because I didn't edit the config-int.php, but that's only a guess. It's a new file and easily overlooked. I fixed by editing the 'settings' table 'Forum Cookie Prefix' field and setting to 'bb' for vBulletin using phpmyadmin.
/ Photopost Integration when using vBulletin 3.0.
Last edited by wajones; December 19th, 2004 at 01:04 AM.
Reason: Clarifing why I messed up.