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This bug was raised on 6th November. A number of other threads have started up on the same subject. Many seem to want back the ability to write a message when declining a game. Without looking back at your last response here, I think it said that you would check and get back to us. What news do you have? Will we be getting back the ability to decline with a message?
I have said elsewhere if not in this thread how to get around the problem of declining players getting stuck in the lobby, so if the programmers can't find the error, then simply make it known to everyone what the workaround is and allow us to send the message we want/need to send back to the invitor (if there's such a word!)