I'll take a look at it. This is one of the things I complained about on the UBB site about not doing an in-place upgrade. You're forced to use a different install folder (unless maybe you're in the "know" and have a lot of experience with the software, which I don't.)
 
I'll look at modifying some referrers and if that doesn't fix it I'll post on UBB. Bottem line I'm sure that we can fix it, just how much effort is the question.