It seems like this is happening to a lot if people! It even happened to me a few days ago. All I can recommend would be waiting a little bit, maybe a few hours to a day, and if that doesn't work, try using another browser. Also try logging out and logging back in not with the box at the top right of the screen, but the one below the site's links, like Forum, Staff, Home, etc. c: If the issue persists, it would probably be a good idea to contact one of the administrators.