I used to be able to see previews of my Photoshop documents in Finder, both as an icon and with Quick Look. Now, all .psd files just show a white box:
How can I change this?
First step : Go to Photoshop –> Preferences –> File Handling settings, and set both Maximize Compatibility and Image Previews to checked.
If that does not help, the article FIX: Quick look on OSX not working (black box) suggests two solutions: