Ok... SO I renamed the vbulletin installation directory from /forums -> /forums_legacy and the problem is solved, right?
Now the redirect scripts cannot be used because every single vbulletin link is now broken because the new URL is domain/forums_legacy vs. domain/forums. So we'd lose every single link to our site from Google etc.
We can't be the only ones that have run into this problem with the default routing... Can anyone point me towards a solution? Thx!