Video Thumbnails Broken

I have one PC with Windows 10 Home on it that has suddenly stopped displaying video thumbnails. Funny thing is that on other PC's on my network it works just fine. Picture thumbnails work fine but video thumbnails have stopped displaying at all. I have checked the obvious windows settings and also scanned for problems with windows - nothing. As far as I am aware, nothing changed on the PC, this happened in the last month or two. Anyone any clue as to what might be going on?

The problem doesn't seem to be associated with any of these. It has just completely stopped creating thumbnails. I have checked to see if they are enabled in folder view, they are. And indeed, picture thumbnails work fine. It's not just one type of video file, its stopped working for all of them. I have tried deleting the cache, that made no difference.It doesn't matter what size they are set to, it doesn't create any. It used to spend some time creating thumbnails whenever I went in to a folder - it doesn't do that any more. It doesn't even seem to attempt to create any. Version is 1803. The problem only started in the last few months ( can't be sure when ).Incidentally, what is the latest version? It says it's "up to date" and it's 1803, but my other PC's are saying they are 1809.

Thank you for your help, I found the problem albeit not the root cause. For some reason, Windows 10 was updating, but it had missed some major updates. It's last minor update was just a few days back and it insisted it was up to date, but it wasn't. No sign of the major updates. So, I downloaded the Update Manager and updated manually, and poof, it's all working fine now. The video thumbnails are back. Yay.

It's very possible that it was this "restriction" you were talking about but I thought I would try it anyway. At no stage did it complain about updating or say that it wasn't suitable so I just let it do it's stuff.