I don't use cache, but from time to time I find few items in the Cache dirs list - "enable caching" is disabled, so I have to enable it, clear the list and disable it again. I am sure the cache was disabled all the time, because the folders in the list are just few days, perhaps a week old. I know it's very hard to reproduce, but perhaps someone else has the same problem.
(I don't use cache because of missing include/exclude dirs option.)
Cache issue
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