Thanks for the help/input!
I did not change the tweaks before this started happening (although now, I have reset them to defaults three times, gone back two versions, uninstalled and reinstalled, etc. -- but tweaks remain unchanged), and all my books are in English. That's what's got me exasperated - calibre has worked fine for me forever (years?) across multiple Macs... and it's only when I upgraded to the latest build that the little arrow button stopped working.
The only thing I can think so far is that maybe the books being in a series might affect whether or not they are properly sorted in Library Order? That if calibre sees the book is in a series, the little arrow button function defaults to alphabetical sort rather than library order sort?
I'm kind of at a loss to pinpoint what the culprit is.
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