Mystery Solved!
I am admitting my extreme flakiness as a cautionary tale to you all! A few days ago I posted a message that "disappeared." I was sure I had posted it. I even wrote to "Community Help" to say, "What happened?"
Well, what happened is that I posted it to the wrong blog! When you have a whole stack of blogs, this is apparently easy to do!
A big "DUH!" for me!