...that started a couple of days back for NO APPARENT REASON
Preamble...
I run Win 10 Home, and I have always had FS work flawlessly until two days ago.
No update for Win 10 occurred and the problem I now have began after I had been
using FS for about half an hour. Originally I had V 5.1, but then I updated to the latest,
thinking it would solve the problem. It did not.

Here's what happens...
FS appears to open and work properly, whether from its own icon or by double-click on an
associated file. But then, when you press M to Move a file to another folder...
1. The file remains visible on the screen until you scroll the mouse wheel to go to the next file.
2. After that, pressing the M key again, or the Escape key, or closing the window using the X button
ALL DON'T WORK.
The last image remains displayed, and I can only shut down FS using End Task from Task Manager.
Also when I close the App that way, the Process does not always close, and then...
3. You can't re-open FS by clicking its icon or on an associated file until I close the process as well in
Task Manager.

Ta.
Am (a bit perplexed about it).