Hmm. The laptop was open, but Calibre was definitely not running. (Just verified that it hadn't, somehow, managed to get itself set to run as an icon. )
I've certainly still got the source books, that's not an issue. And I've got saved versions of the Calibre library in local databases as well, for when I'm not on my own network.
I'll try deleting and re-adding them. But what would ultimately be better, I suspect, is a way to actually remove all traces of Calibre and start over on machines that are out of sync. That seems nigh unto impossible, unfortunately. (I've tried, without much success.)
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