@Sandra856 Thanks so much! Your suggestion to contact AirBnB directly is also spot on. In fact, as it turns out, I was in lengthy discussions with them long before I ever posted this in the forum. My conversations with AirBnB allowed me to take away these details:
Bug has been known for about a week.
No resolution has been found but efforts are being made.
They are sorry for the inconvenience.
I have asked them if there is a place where they and we can keep track of the progress in solving this issue, and they have not yet responded to that question.
In the mean time, as I said in another post, I've created a second account for myself, made that second acount a co-host and also made it the primary host, and set it up with a payout method. That second account seems to have a functional AirBnB calendar and messaging, so I am hoping it will get the payouts too, as I don't want to end up like the other hosts who have not been getting their payouts.