I installed cinnamon DE. Everything seems to work EXCEPT even though I have
window backgrounds and wallpapers installed and available, the system cannot
use them. This same box has Plasma 5 and GNOME installed and both have no
issues.

In Cinnamon icons, applications, resolution work perfectly...only on a light
gray desktop. I removed Cinnamon and then replaced it hoping that something
would be replaced that might have gotten "buggared", but the same thing
continued.

When Cinnamon opens and closes, I can see a GNOME wallpaper for a very brief
split second.