Desktop background changes color

[steel]

So I'm having kind of an odd problem.

I've got a laptop (a Lenovo Yogo) that I take on and off of a USB 3.0 docking station from time to time. When I dock or undock I get some resolution issues, so I need to sign out / sign back in to Windows 10 to clear things up.

But here's the odd part. Whenever I do that my desktop background changes to "solid color" black. I can right click on the desktop, then click personalize and choose another color, but if I plug/unplug the docking station then sign out/in then it changes back to black.

Note that this is not the "black screen with nothing but a mouse pointer" problem that a lot of people seem to be reporting. Everything works totally normally and I can see all of my desktop icons, etc. It's just that the customizable desktop background color gets selected as "black".

Any thoughts?