Donk

Ah, OK, many thanks!

Yes, and that's what I really appreciate. Thank you!

See this thread to see how to detect the source of it and how to fix the problem without rebooting...

Have you tried refreshing the screen display by pressing F5?

To refresh the screen it needs to be the one that has focus before F5 works. To give the desktop focus simply click on any empty space...

Try running this batch file. You'll need to unzip it first. It contains SFC /Scannow, DISM and CHKDSK commands in order to find and fix...

Do I take it that the problem is now resolved? Yes, just double-click on the bat file to run it. If it fixes the issue then no need to...

Many thanks! Very surprising, another one had that issue. OK, I will try that (if need be) after using wiganken's great script the next...

Yes, that is right. So the symton is gone at the moment, it sometime will come back. Like it did in the past, I guess, 5 or 10 years...

Thank you very much! I had to reboot, so now the remnant is gone. So when I have the same problem the next time I just would click the...

Thank you! So here is the desktop: Clicked on the (black) ground and pressed F5, the remnant is still there.

No, I didn't. Pressing F5 refreshes some programs / pages with me. Not the screen I would think. How (else) could one refresh the screen?

Occasionally, remnants/parts of programs remain visible on the screen after closing the program, which I cannot get rid of except by...