Finder doesn't show quick look / preview? Do this:

Hi, I'm having this problem as many others, but the problem doesn't solve relaunching Finder but

com.apple.quicklook.ThumbnailsAgent

I have this script in Automator as an app in Dock (as it happens too often)

do shell script "killall com.apple.quicklook.ThumbnailsAgent" user name "MYUSERNAME" password "MAYPASSWORD" with administrator privileges


do shell script "killall Finder"

it worked days ago, I don't know but now the script doesnt force quit com.apple.quicklook.ThumbnailsAgent, only Finder

It works however if I force quit process in Monitor Activity and relaunch Finder manually

I'm in a brand new Mac Studio all updated, no TimeMachined, so brand new system. So this looks as a macOS bug

in Macrumors forum there is a thread about this as old as Catalina

Hi KenHoping, We appreciate you reaching out to us. We understand that you are experiencing issues using Quick Look after relaunching Finder.

We’d like to gather additional details that may help us be in a better position to assist you. Are you receiving an error messages when you try using Quick Look after relaunching Finder?

Are you using the same steps in the article below to use Quick Look?

View and edit files with Quick Look on Mac

In the meantime, we recommend that you check if the issue persists when signed in on a different user account. 

The article below can help if you do not have any other user account to test with.

Set up users, guests, and groups on Mac

If you are experiencing the issue when signed in on a different user account, we recommend that you check if the issue persists while on safe mode. 

Below is an article to help guide you through the process.

How to use safe mode on your Mac

Take care!

I'm running Monterey, 12.3.1 and since installing when I put a .mov file or do a screenshot, I get the PNG emblem instead of the thumbnail. MOV files give me a QuickTime image. A .jpeg works like it should. I have tried the Finder relaunch bit, does not work. Neither does the force quit. Two days ago I did both of those and then did a restart and it worked. Today, I'm back to icons not thumbnails.