So, here's the latest clue (in case anyone is still interested in this puzzle):
After I side-load new books, and the shelves disappear, when I try to re-create one of the old shelves, I get the "Unfortunately NOOK has stopped" error.
If I add the books to a shelf with a different name, and then try to change the name of the shelf back to the old name, I get "another shelf by that name exists." Aha! Could it be that the previously created shelves exist? Could they be recovered somehow? (I'm sure I don't know how!)
It's only after the NOOK is synched that the lost shelves are truly cleared, and another shelf with one of the old names can be created.
Any thoughts?
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