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Quick fix for Quicklook not previewing files - follow up

I continue to have an issue in Catalina where hitting the space bar (having single clicked on an image or video file) fails to provide a "Quicklook" preview, as it did in Mojave.

This solution below from GonçaloCatarino, works for me (thanks Gonçalo), but after a certain amount of time, the problem then arises again, with Quicklook not working - even before my Mac has been restarted - in the same session.

Anyone have any additional advice on I might add to this Terminal command to make it permanent, not temporary?

sudo update_dyld_shared_cache -force

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Answer from 2018

GonçaloCatarino

quick fix for Quicklook not previewing files

This is not so much a question but rather a quick solution for this (somewhat frequent) problem:

#1 - open Terminal.app

#2 - Copy/paste

sudo update_dyld_shared_cache -force

#3 - it should take 1-2 minutes.

It worked for me.

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Posted on Oct 7, 2020 1:00 PM

Top-ranking reply

Old Toad

Level 10

210,301 points

Posted on Oct 7, 2020 1:20 PM

Boot into Safe Mode (How to use safe mode on your Mac - Apple Support) by booting with the Shift key held down and check there to see if the problem persists. Reboot normally and test again.

NOTE: Safe Mode boot can take up to 10 minutes as it's doing the following;

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts

• Deletes font caches, kernel cache, and other system cache files

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Quick fix for Quicklook not previewing files - follow up

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