MP4 thumbnails broken.

[mkr10001]

Suddenly started noticing mp4 thumbnails show up as "white pieces of paper"

In details view in explorer where there should be a vlc icon, it's the plain white icon. If I change the view to thumbnails it's the same but bigger, it then changes to the proper thumbnail but going back to details brings back the white icon.

I've updated to the latest version and left the default settings. Still the same