Functions lost after 21.19

I've had this watch about 6 months. I'm used to pressing the lower left or middle button to see glances.

After 21.19, nothing happens when I push those buttons in normal watch-face mode.

However, the press-hold functions work, and both buttons work to scroll up and down in menus. Both buttons will turn on the screen from blank state. So the buttons aren't broken electro-mechanically - it's a firmware problem.

I've tried power off and on twice. No change.

Any ideas?  Thanks.