If you are using Chrome, it's because there was a change to their cookies. We are working on a fix, but till then you'll need to use a different browser.
Actually scratch that. It gave me the same screen, but instead of just repeating the same screen, it now has me as a guest against one white dragon. I am listed as logged in, but it won't recognize me except as a guest.
Ah. I was able to get to where I could be given a chance to login and now it appears to be fine. Any clue why it said I was logged in and could access this thread but the game insisted that I wasn't logged in?