Well, things are getting weirder. To answer your questions, I began by going to a post on the Florida board that I wrote earlier this AM and added a sentence. As before, I could access my original version and I could type new material. However, as before, I could not save my edited version. The same dialog box came up.
Then I went to the site talk board to try to reply to YOUR follow-up message. Whoops! The result was the same -- no luck -- but the reason was different. This time, the message was telling me that I had to have words in the reply. So I tried Plan "B". This time, I tried replying to my original post with the answers to your questions. Again, I was told that my reply had to contain words.
So now, I'm trying Plan "C." This is a completely new post since I was able to do this based on my Florida post earlier.