It can be REALY annoying to move a forum over to a new server - if that's what you're Yak_folks are doing. So I can empathize completely the troubles you're having.
Though, maybe you want to ask the folks here at JD about it, seeing as how they apparently just moved everything to SMF (simple machine forums) and seem to have managed to bring over EVERYthing intact. Even the messages.
I could be terribly wrong, but I think the web address is different, and the old forums looked a lot more like ProBoards than SMF, so it's gotta be worth a try....
Anyway, I can't wait to see YakFace with a better forums. Things have really taken off over there despite any bugs, it has quite a bit of customizing traffic now (more than here)!