Window goes blank when using adjustment layers

1. In Photoshop 20.2.0 the window goes blank temporarily when using sliders in adjustment layers. If I click on a position for the slider it doesn't go blank, but if I drag the slider it goes blank until I stop sliding.    2. When I click save, the file saves and the window goes blank.   3. If I click outside Photoshop the window goes blank and when I click back into the window, it's still blank unless I click on any History state.