I just figured it out or re-remembered it ;-) If a post disappears, hit the reload button and it should reappear. This happened to me a day or two ago because my big clumsy fingers accidentally highlighted the entire post and the next key stroke replaced it. You got to be quick! My 'puter is resaving every 30 seconds. I'd sure hate it if it saved the blank screen before I reloaded which is apparently what happened to me the other day ;-( I thought I was doing the wrong thing and not finding it, but apparently it saved before I clicked the reload ;-(
Hope this saves some of you a little grief ;-)