Thanks Opal!  Disabling the Compositor definitely fixes this issue.

On Monday, February 27, 2017 at 5:10:57 PM UTC-7, Opal Raava wrote:
> On Monday, February 27, 2017 at 9:41:20 PM UTC+1, ianr...@gmail.com wrote:
> > On Wednesday, October 26, 2016 at 8:43:12 AM UTC-4, John Maher wrote:
> > > I'm getting the strangest thing on my screen. I'll be working and the 
> > > XScreenSaver dialog pops up (indicating the screen is locked) and the 
> > > screen goes black. However, the screen is not locked. I have to move a 
> > > window around to redraw my screen. This has always happened since I 
> > > started using Qubes about 3 weeks ago. There appears to be no pattern 
> > > that prompts this response. Bizarre! Any thoughts?
> > > 
> > > Thanks.
> > > 
> > > John
> > 
> > I found that this happened when I had the Qubes VM Manager set to appear on 
> > all desktops ("Always on Visible Worksace").  When I stopped that, it 
> > stopped the problem.  Tried this 5 or 6 times on 2 different machines.  
> > Running v.3.2 with and without Feb. updates; no difference.
> > 
> > HTH,
> > 
> > --Ian
> 
> Oh that's interesting, I found that disabling the compositor (Menu>System 
> Tools>Window Manager Tweaks>Compositor) solves the problem for me and also 
> for somebody else on the github tracker entry. 
> 
> I can't find the 'always on visible workspaces' settings, but I also lost the 
> tray icon for the Qubes VM Manager somehow.

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