I was playing a game earlier tonight with a friend, we both quit, and now when we try to get back on, we get this error (both of us do).
Interestingly, I just noticed that, when I initially go to the Ironclad Online screen, and click "Log in", it depresses the button and then does nothing the first time. Then, when I click it again, I get the disconneted error. This is perfeclty consistent—every time I leave the screen and then come back, the first button press does nothing.
