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Quick Look not working with .mp4 files in OS 10.13.6

I recently upgraded the OS on my iMac to 10.13.6, and immediately one problem I've noticed is that Quick Look is less functional that it was in 10.11. Specifically, if I try to Quick Look at an mp4 file, all I now get is a perpetual circling wheel. The preview never appears. Doubly odd in that, on a 2012 MacBookPro with the same OS, the Quick Look opens mp4 files just fine.



Posted on Jun 27, 2020 8:27 AM

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Question marked as Top-ranking reply

Posted on Jun 27, 2020 1:41 PM

Works fine here on my iMac running 10.13.6


Safe Boot from the HD, (holding Shift key down at startup), does the problem occur in Safe Mode?


Safe mode attempts to repair Disks & clears lots of caches, so if Safe Mode works try again in regular boot.


You can save us asking dozens of questions by submitting a report from this App for us to look at…

EtreCheck is a simple little diagnostic tool to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac. It will not display any personal info.

https://www.etrecheck.com/


Pastebin is a good place to paste the whole report if you capture the URL while there…

https://pastebin.com/


Workable but harder for me to work with...the Note tool on the bottom of this editor's toolbar, as shown in the image, to copy and paste the output from EtreCheck. In a Reply before you click post, look for this to add longer texts...

3 replies
Question marked as Top-ranking reply

Jun 27, 2020 1:41 PM in response to Gregory Frost

Works fine here on my iMac running 10.13.6


Safe Boot from the HD, (holding Shift key down at startup), does the problem occur in Safe Mode?


Safe mode attempts to repair Disks & clears lots of caches, so if Safe Mode works try again in regular boot.


You can save us asking dozens of questions by submitting a report from this App for us to look at…

EtreCheck is a simple little diagnostic tool to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac. It will not display any personal info.

https://www.etrecheck.com/


Pastebin is a good place to paste the whole report if you capture the URL while there…

https://pastebin.com/


Workable but harder for me to work with...the Note tool on the bottom of this editor's toolbar, as shown in the image, to copy and paste the output from EtreCheck. In a Reply before you click post, look for this to add longer texts...

Quick Look not working with .mp4 files in OS 10.13.6

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