I think this must be a bug.  I started a match with a bot (BlunderBot_VII), and got to a point where a game was lost & tried to resign - but apparently when it was not my turn.  Then as I've seen happen before, after clicking the X, the Bot would not play and would say it's not your turn if I try to roll.  Logging out & back in did not work.  In the days since this happened, I have rejoined the match several times, and the game is always stuck.  BlunderBot_VII thinks it is not my turn, but it will not move.  I kibitz and chat, but it asks "Are you there?" and then eventually quits.

Is there any trick to unstick this match?

Thank you socksey - that was info that will be useful going forward.

I hope that the bot controller will be able to fix the problem without having to be online at the same time as me.

ya its a right decision.