It's a glitch in the chats. Sometimes it fixes itself. But other times it requires waiting for Robo to reboot the servers. He has a set schedule he does this on and will not do it just to fix this issue for someone. Mods can try to 'boot' you from the room, but, from what i understand, more often than not it doesn't fix the problem.
It's not a browser issue, it's on the server side.
Typically if it happens they make you wait. But i know under some conditions they allow people to make a temporary new account until their name clears. I'm not sure what exactly the parameters are that they allow this under.