This was bugging me for months until I took some time to figure it out.

In case your QuickLook function on Mac OS X 10.11 or up stops previewing plain text files — and only plain text files —, don't depair. Just remove the QLColorCode generator from ~/Library/QuickLook and exchange it for an updated one that actually works. Afterwards run qlmanage -r to reload all generators.

I found out that the QLColorCode generator hijacks public.plain-text by running qlmanage -m | grep text. Since code highlighting wasn't working for quite some time I figured this might be the reason text preview also fails. Which turned out to be true.

All other solutions I found on the web did not work.

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