Since Yosemite i'm having this strange problem with Quick Look (giving previews of files when pressing the space bar): whenever i preview my files they are displayed transparently. Pretty irritating for images, and very inconvenient for text files (see image).

I've tried switching off the 'Reduce transparency' option in the Accessibility preference pane, but to no avail.

Does anyone know if this is a bug in Yosemite or some strange setting i can change?

enter image description here

  • Not an answer, but have you poked around on your system to inspect which Quick Look plugins you have? Check out this information: cnet.com/news/fixing-quick-look-issues-in-os-x The information about clearing and regenerating your cache doesn't seem to apply to your case... more for a situation where a file type on your system isn't supported by Quick Look, and you think it should be. Your case sounds more like there might be an unexpected plugin for JPEG file type? something that is overriding Apple's default behavior?
    – user100590
    Commented Nov 13, 2014 at 21:56

3 Answers 3


For those still looking for this answer, a simple reboot did the trick for me.

  • Rebooting worked for me as well. Still pretty weird though.
    – Husky
    Commented Nov 16, 2014 at 10:46

Instead of rebooting, you can simply enter "killall quicklookd" in Terminal. That fixed it.


relaunch your Finder in Force Quit Applications will fix it

  • 1
    Quitting and restarting Finder worked in my case. I did not need to force quit it. Commented Apr 29, 2015 at 13:48
  • 1
    @ClaytonStanley isn't that the same :]? The Force Quit window will automatically change the text of the main 'Force Quit' button to "Relaunch" if you select Finder.
    – Isaiah
    Commented Mar 21, 2017 at 18:44

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