Someone's got to be a special kind of loser to hack a forum account of all things.

My condolences. And unfortunately, I doubt forum staff is going to be able to do anything beyond possibly banning the IP that was used to intrude into your account (and won't even tell us about it), which would most likely be done through a proxy unless the hacker was a blind idiot. I'd be more concerned if they used it to gain access to your in-game stuff for real.