Question mark could mean that it just hasn't gotten to scanning that yet. Asking it to refresh is the same as asking it to scan something again. But if it has so much work to do that scanning it is going to happen in the future, re-scanning will also happen in the future.

Or it could mean that it broke - failed to read the files in a folder.

We should be looking at the logs to find out.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)