Mark and Victor, did you perform any code changes (especially JavaScript) recently? If so, consider about reverting those changes back and check for the issue again.
Sometimes even minor code changes can cause issues like this so it is always a good practice to revert changes back once something goes wrong.
mine is here: http://uploadnudepictures.com/my-profile
then when I say click "change role" cuz i disabled the other things it goes black, I tried getting the firebug but nothing seems to happen when I face this black screen. Id be willing to pay someone to get this fixed for me along with the chat, it worked for a day or so then stopped, but in admin it shows people online so im little puzzled, maybe a cron thing,