Forum Change Cookie prefix and now can not log in
 

I've been crating a copy of my live site to run through vb4 upgrade secnarios. So I copied my DBa db FS, created a new DB and a subdirectory called vbtest and edit my config.php in teh vbtest to reflect all teh new settings. I then logged into the vbtest site and change teh cookie prefix, forum home etc.

I the upgraded the vbtest to vbulletin 4.0 (from 3.8) All worked a treat!

However - it seems the cookie prefix and possible forum home changes were made on my live site! I can still view forums etc, but can not log in! If I tuen off cookies in my browser, I can log into forums, but can not log into AdminCP (says I was successful, but then kicks me back to log in screen)

Anyone know how I can recover from this? I have daily backups and could do a partial restore if I knwo which table. An easier way would be, well easier!

Many thanks!