Font glyphs disappeared?

All of a sudden, all of the glyphs for font characters aren't accessible any more.  Obviously, just for fonts with alternative characters.

I type a word, and highlight it with the text tool, and I don't get any arrows underneath to click with the alternative characters.

CorelDraw 2020, Windows 10, haven't changed anything since the last time I used this (a couple of days ago). Well, that I'm aware of.

Works fine in CorelDraw 2018, which is still installed.  Glyphs docker shows all the glyphs, but I don't have time for that.

Help appreciated!