Are you sure it couldn't be server related though? Or port related? Maybe some left over info is being called from somewhere? Or it permanently affected the way the forum is displayed on the server?
This stuff's complicated and nothing's impossible, so I won't say it's not a possibility. We just don't see what it could be. You went back to an old database so it's nothing in the database (you are seeing *old* content when you look at the old database, right?). Like Joe says above, you could upload all the vb files again, but there doesn't seem to be any way that for that mod to modify files, so it almost certainly won't matter. Did you force a reload in your browser (it's browser depended and I don't remember how to do it - hold down shift or ctrl when reloading, or something like that). There's nothing left, unless you have some other kind of caching set up (but you'd probably know about it if you did, unless someone else set up the site for you).
ETA: you have multiple styles - is it possible you switched styles and one of the other ones looks different?