Icon thumbnails not displaying on Mac desktop

When I updated my Mac to the latest version, my icon images of Krita files stopped displaying. I just get a blank white icon now with the file name underneath. Any thoughts on fixing this?

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I don’t have a mac so these are just ideas.

In Krita, do you have ā€œenable native file dialogsā€ selected? (It’s in configure Krita > General > Misc.)

In your mac, is there a way to associate .kra files with Krita? We do this in Windows, don’t know if it works the same in macOS, but since you just updated, perhaps this step needs to be done.

Is it just the thumbnails missing or quicklook preview as well (pressing spacebar)?
Make sure Show icons preview is active for the folder: cmd⌘+J

Some things you can try from Terminal app:
qlmanage -m
and see if you see this listed: org.krita.kra -> /Applications/Krita.app/Contents/Library/QuickLook/kritaquicklook.qlgenerator (1 - loaded)


qlmanage -r
Force reloading Generators list.


qlmanage -r cache
Reset thumbnail disk cache.


killall -v com.apple.quicklook.ThumbnailsAgent
killall -v Finder
Force quit the thumbnail process and restart Finder.

Or there could have been API changes to thumbnail generation perhaps.

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I have the same issue on macOS Sequoia 15.0 and Krita 5.2.3.

Both thumbnails and QuickLook previews are not working, so the issue is probably related to how Sequoia handles extensions as Krita and other apps with broken thumbnails/QuickLook previews don’t have their extensions listed under System Settings > General > Login Items & Extensions > Extensions > Quick Look:

I sent a ticket to Apple on the issue but it was resolved as ā€œInvestigation complete - Works as currently designedā€, so I think there was a change in the API of the thumbnail extension installation approval.

I tried both with enable native file dialogs off and on, either way files with the .kra extensions don’t have thumbnails.

Yes there is a way to associate .kra files to Krita, by default it already is.

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Krita isn’t listed under the equivalent setting on macOS 12 either (System Preferences → Extensions → Quick Look), so I’m not sure that’s a good tell or not.

Is krita listed as loaded when you run qlmanage -m ?

You can file a bug here:
https://bugs.kde.org/

I think there’s a correlation. Many apps had their thumbnails broken on Sequoia, for example Krita, Affinity Suite and Clip Studio Paint. They had working thumbnails on macOS Sonoma 14 and earlier but were never listed under Extensions, and all of them are unable to display previews after upgrading to Sequoia. Pixelmator Pro and Logic Pro extensions were already listed before Sequoia and are still able to display file previews.
This pattern, combined with Apple’s unwillingness to investigate the issue further, leads me to believe that it is now mandatory to list thumbnail and QuickLook extensions inside System Settings for them to be activated or disabled.

No, org.krita.kra -> /Applications/Krita.app/Contents/Library/QuickLook/kritaquicklook.qlgenerator (1 - loaded) does not appear in the list. I reset quicklookd, cache and restarted QuickLook and Finder.

I’ll look into submitting a bug report later today.

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Submitted Bug 493474 – Thumbnail and QuickLook previews not displaying on macOS 15 Sequoia.

Support for QuickLook Generator plugins has been removed, developers will need to migrate to the new API. For now we can only wait for an update. macOS Sequoia 15 Release Notes | Apple Developer Documentation

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