Installed Painter 2021, update from 2018, fails to load

I purchased the 2021 update, installed and most of the time I get the opening image, then with the grey background, then the black and then *poof* it's gone.

Assistance suggested emptying Temp folders and re-install, did that and it worked - like, once.

Now it's not working, aside from being installed and showing the opening image.

Sent log file and reports to the folks at Corel, wainting for feedback. Helpful info or suggestions welcome.