Similar issue, only my wallpaper turns completely black and I can still see the image in the translucent fences folder when I open it.
I only have one static image set in Windows interface, and problem will go away if I click the wallpaper again in windows (just temporary) or if I disable fences. While disabling fixes the wallpaper, if I re-enable fences the problem will be right back. The only fix I can do is set the wallpaper again each time it goes to black. I do this 1-2 times a day. I also had a random issue a couple of times, where a window was behind the icons.
One thing that might be related, I use a lot of memory in other apps. I have 16GB of RAM and my page file can get up to 20GB with ease. Memory in windows reports 75-80% usage.
DeskScapes 10.0 (just updated didn't restart yet, not currently in use)
Windows 10 Pro 1903 / 18362.418 (updated 6 days ago, but was doing the same before)