That was quick. UI version 20200116b brought the display back.
Thanks for the quick fix guys.

Yeah, new UI version 20200116 auto installed sometime today on win 10 computer shows no display on all channels. All menus show fine, just no channel display. I don't have "early access" enabled. App version is 20190611. This is using Prime tuner on Comcast cable which was working fine this morning....