Black icons in folder tree

Hello. I've got strange black icons in folder tree (never tried it before) and in a Lister. how to fix? (no such problem in FE)

Is it always the same icons, even after a reboot?

fixed after reboot

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Let us know if it happens again, but if it was a one-off it might be some kind of icon caching issue. (Still a few of those in Windows, although it isn't as bad as it used to be!)