In my group game hangs in 1 of 5 games for all players when the window "game ended" (don't know exact translation, playing german) appears. When we reload the page we can play again, but the game is not counted.
Game #130254451 on Oregon
Something like that should only happen twice a day, at 8 AM / 8PM UTC, when the servers are restarted/swapped. Also the game does count (if it was rated) it's just not reflected in the client right now.
The developer is working on a system where these server changes will be less intrusive.