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Finally ... I found page providing some QuickLook solutions based on Homebrew's caskroom: brew cask install qlcolorcode This is based on a fork from and old repository but is maintained and developed quite well at least until today. I gave it a shot and it works just fine, though I still prefer the dark theme of TextMate :)


Create a guest Account and test if the problem still persists. To activate the guest account use the following steps: Open System Settings Users & Groups, click on the lock below to unlock it and type your password. On the left panel you see the Guest Account, activate it and log in and test. Deactivate it if you're done. Repair disk permissions ...


This may help : or You should be able to rebuild the so called ThumbnailCache on your mac. This should work. hope this helps :)

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