My site went blank.
Fixed this by deactivation plugins in FTP.
Went to plugins and reactivated all I previously used except the newly installed that might have created the problem.
Got a msg that saying that no backup could be made. Since I had a plugin that backuped called aiowp_backups, I deactivated it to see what would happen and the mg went away.
I then edited a post. Clicked on update, got the usual proofreading box. Clicked on update again and got the msg. "Post updated". I then clicked on "View Post" and discovered that the changes had not been made. Tried a few other posts. Same thing.
What to do?
Note: This was the first time ever that I used FTP and the only change I did there was to add .hold to the plugin file.