Hmm, it would seem that maybe something with the shoutbox is causing the issue. Two things you can do to try and fix it. First would be to check if there is something in the shoutbox that is doing it. You can try and fix this by deleting all of the current shouts with the following sql command:
truncate table ubbt_SHOUTS
If that doesn't work then you can force his right column off and see if that fixes it. You'll need his userid and then you can run the following sql command, replacing # with his userid
update ubbt_USER_PROFILE
set USER_HIDE_RIGHT_COLUMN = 1
where USER_ID='#'
