I am using a windows 10 machine with the current updates, 16 GB Memory, 64-bit. and a NVDIA geForce GTX 1070 video card. I am using 2 idnetical 27" LG Flatscreen Monitors. Drivers for all devices have been updated.
I use a neutral Grey background as I use Photoshop all the time. When starting the computer, probably 50% of the time I start or Restart the machine the background color reverts to black. This has happened for several years including when using a previous workstation. the screen does not turn to greyscale or solid black with no icons showing.
I know I can go into Settings > Personalization > background and change my color back to the grey I use which I do but it is a pain in the ass to go through and constantly do this.