I've observed two games now, and when both ended I got stuck on a black screen. I had to reopen the client. Edit: Third time relogging, observed 2-3 games with no problem. But I just played a game and i'm stuck on a black screen again.
Hmm, could be a driver problem. Make sure to update your video drivers. If you continue to have this problem please contact our customer support. The reason why we can't do it hear is because it might require getting some game logs.