Ok… I got the generic nanoKontrol2 working. Right click on the triple dot menu and select “Learn MIDI Device”. After moving a slider it was reactivated green and all the aliases also returned to a green state. So I’m back in business again.
I removed all the Korg driver software as well. Those drivers required rebooting if the unit lost power or had to be plugged back in. I read the generic MIDI driver doesn’t have that issue.
If I ever need the Korg Editor software again I’ll install it and the Korg driver on a separate laptop.
Still confused what update caused this problem. Don’t remember updates coming through recently. It wasn’t a feature update. Guessing a monthly cumulative update.