Just queued for a game in a party, tried to join a game and the accept button wouldn't work. The tab seemed stuck on '5/10 ready', so we all restarted dota and were met with the message '6/10 A player has declined the match' on the ready-up tab (as is usual when someone declines a game or times out). So we all restart steam, and the message persists; none of us can enter matchmaking as it is is stuck on 'A player declined the match', and will not allow us to queue for another match.

Anyone else encountered this problem?

Note: The problem has alleviated since this message was posted, but is nevertheless a serious bug with matchmaking that could potentially prevent people from playing.