Screen not updating (at all) for Acrobat Reader DC - like, can't scroll, type, etc.

I've tried before and never got an answer.  Previously there was a problem with screen stutter - if I scrolled down, the document never appeared, and the last line was repeated over and over.  Never got an answer on why or what I might be able to do about it.  Now, the screen flat out does not update at all.  If I minimize and maximize it, the document in the view appears.  Min and Maxing it is not a viable solution - especially when filling out forms.  I can't see what I'm typing on forms until I min and max it - correcting errors is nearly impossible. 

Any Ideas?