Hello, I have a very strange issue, this time on one of my W10 PCs (not a customer's).
There seems to be a transparent window on the desktop, as you can see in this image:
The window isn't there immediately after boot, but after an undetermined amount of time it will appear.
I can also enlarge it or shrink it but I can't close it. And I don't know where it comes from.
Do you have any suggestions? What can I try to find out the origin of the window? I've tried closing non-essential background processes, to no avail. I have A LOT of processes running in the background.