Calibre stopped seeing all my libraries except the current one
(Using MacOS 10.11.6, Calibre 3.42) I have several calibre libraries, and have been using and switching among them quite smoothly. Now all of a sudden I seem to be "stuck" in my current library ("Nonfiction') and calibre no longer "sees" that there are any other libraries to switch to. Examination of files in the Finder shows all the library folders to be there where they ought to be, also they all seem to have .db files with respectable sizes and no weirdness in their "last modified" dates. Why did this happen, and what's the most straightforward way for me to fix it?
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