Tom,
I have vB support looking at both and there is a possibility the site has been hacked in some way. It doesn't seem to be affecting too many things but I think it's better we resolve this before it becomes an even bigger issue. I'm by no means an expert of vB so i'm unfortunately in the hands of their support which until now have been fabulous. Failing that i'll have to try and find someone or consult their support forums.
Who would ever have thought running a forum would be so much hard work