I figured it out. The new version presented all of my notes in html, which would not accept editing. Of course, we can't tell the difference by looking at it.
Atop the note was a little symbol indicating that the text was html formatted. I clicked on it (right click?) and was given a choice to remove the formatting. I selected it, and voila! I was back in text mode and all was well.
There was no clue to be found anywhere that this was the way.to "unfreeze" the text, and I just followed my hunch.
In my opinion, this fiasco reflects incredible negligence on the part of ENote programmers. Perhaps arrogance?
p.s. All this on my P.C.