Hmmmm...I think I might have got the problem too. I don't see weird names in the F9 list but I often get ctos when playing and have to rejoin again. And when I do, I find myself warping around the lvl. To fix this, I simply rejoin again but once I couldn't fix it. I rejoin and rejoined but I still got warped around. There was nothing suspicious when I pressed ctrl+alt+delete and I think it might be some kind of internal bug in JJ2. Maybe.