[twhiting9275]

On further investigation, it has been found that this IS a software problem, and reported to the software developers. I've moved the thread into the 'reported' forum so that I can keep an eye on it. This is not an SMF problem, rather a multi-forum client problem.

This isn't your forum being 'hacked', this is simply an avatar being added to another user on another forum. My suspicion is that it has to do with uploaded avatars only, but I can't speculate too much on that. I'm actually rather surprised that it hasn't come out before.