LT, do you really think someone knows your username and password? I don't think any hacker would spend time to hack a free account. Did you sign in the forums on a computer that can be accessed by others? If you checked the 'remember me' box, others can get in the forums as you without your password.

When you see it happens again, can you quote the exact error message to me? Or just save that webpage (in html only format) and email it to me? I am wondering if it's the forum program at fault.