Just to make things interesting.
I am running Premiere 19.2.2364 on a Win 10 Home acer laptop (the real cheap one). Also have the same version on my Win 10 Pro desktop box.
Tonight the Acer gave me the white screen. Did a repair/reboot - no effect. Read the support forums. Rebooted - still blank. Did a second, then a third repair.
Then I rebooted again. Got the same damn white screen. So without doing anything else, shut the system down.
Waited 5 minutes and rebooted.
Everything is fine.
WTF?