LOL, I just found this as a possible solution.
In the meanwhile I also did the sfc /scannow with zero issues.
I am busy with your suggestion.
UPDATE: I did do the purge, and clean win10 startupwith a new user profile, and still exactly the same issue.
The fences windows are there, I can click icons I can see.
FIRST TIME ONLY,if I hover over the title, then the hamburger menu is there, and resize cursor, but as soon as I action it by actually left clicking, then nothing further happens.
I dont have any funny moving desktops, just a default photo, no sliding anything.
I dont know what to do further.
I can only think it is a windows 10 issue.