Recently my PSD files don't have a preview image when they're in a folder.

Recently my PSD files don't have a preview image when they're in a folder.

I'll search for images (show as icons option) in a folder on my desktop, and the PSD files previously had a nice preview so I could easily choose the file I want.

Now most of them are just white square previews, or just certain layers showing in the preview.

Is anyone knows how to fix it