Got it!!!

The problem of the disappearing ATOM file turns out to be trying all the posts in Word, and then copying and pasting into the editor box. We who use Office all the time know from experience that Word hides special characters in the copying process. They are invisible little creatures that only Word understands. Blogger doesen't understand them. ATOM doesn't understand them.

So, the fix is to write everything in Word, copy and paste the text into notepad to remove all the invisible junk, and then copy from notepad and paste into the editor.

Or, do what I am doing now, and write directly into the editor. The trouble with that is, I am a horrible typist. Word helps, sometimes.

Now ATOM is back!