Thumbnails disappear - also in File Explorer and others

[hideabed]

Please help me with this confounding problem. In Windows File Explorer, my images would have nice thumbnails in a certain folder, then if I switch folders, and return, they would be placeholder images.
So I tried about 10 solutions suggested online. No luck.
Finally, I did a Repair Install of Windows 10. No love.
So I then tried Total Commander, and now Free Commander, which is awesome, but still the same problem exists.

Does anyone have any suggestions, please?
Windows 10 Pro. 22H2. 19045.2311. Intel Core i5-2500K CPU @ 3.30GHz 16 GB RAM

[Dreamer]

Similar problem:

Thumbnails not showing - FreeCommander Forum

I have no real solution, but I had this issue few times, it was fixed itself in few days, so try to wait, leave Windows Explorer or/and FreeCommander opened all the time in background.

Workaround - if you really need the thumbnails now, try the XnView or XnView MP, with an internal thumbnail system.