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My Macbook has suddenly stopped generating preview icon of all file types. So all files are now replaced by their respective generic file type icons (see picture attached). Moreover, when I quicklook any file, the preview appears corrupted.

I have not updated any software recently, nor have I modified any file systems.

Any help would be much appreciated!

Corrupted Quicklook and Icons

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    First thing I'd try would be to run "sudo qlmanage -r" in a terminal, which will reset the QuickLook subsystem. – calum_b Feb 29 '16 at 11:16
  • Cool... I'll add it as a proper answer then, didn't think it'd be that easy :) – calum_b Feb 29 '16 at 13:07
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Per comment under original question, first thing I'd try (which turned out to be the solution) would be to run sudo qlmanage -r in a terminal, which resets the QuickLook subsystem.

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Merely running sudo qlmanage -r did not fix this issue for me.

For me, the direct cause was QLStephen.qlgenerator. The issue happened overnight and I suspect Apple's latest silent OS X update may have played a part in this. I removed the plugin the same way I installed it (Homebrew); if you manually installed it, simply drag it out of the plugins folder in your Library and run sudo qlmanage -r

Thong.qlgenerator also caused an issue for me (PNG only showed as an icon).

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