We're still looking into the exact cause, but we think we have a solution to get everyone safely back into the game. Unfortunately, we're still sorting it out, but we have hopes that we can fix people before tomorrow night's activities. Anyone who is having this problem needs to send tech support their account name and the server they're having the problem with (please don't post this information here). We're collecting this data both to determine what caused this and to fix the situation for those affected.
~Silthe