I've come across this many many times now. Someone will join and create a username that is just way too long. A thread I just looked at that someone was asking for c&c on his photos filled half of my screen with the panel that shows the name/avatar. I would suggest a limit on the length of usernames from this point forward. I doubt there is anything that can be done with current members unless they reapply with a new name. I see that if there is a space in the user name, it will wrap in the panel displaying it. The one I just saw that I mention above though had underscores for spaces and it ended up pushing his thread body over to the halfway point of my screen.