The issue preventing some players from logging in has been resolved. If you still can't log in, uninstalling and reinstalling the game should fix the issue. If you haven't registered your account and need to recover it, please contact customer support HERE.
Original Post: We are aware that a small portion of players are unable to log into the game and are currently investigating the cause. If you are unable to log in, please post on this thread with your username, but please do not make a new thread. We will update this thread with updates as they become available.