I should probably just have posted the second half of my first post: I've decided to wait to restore my collections until I either have an evening's worth of time to spend on it (because I want to check and see if they all return as they were), or until a new version of Calibre comes out, whichever happens first.
I kind of assumed that was implied from the fact I read the whole message, and decided not to follow the instructions in it.
My bad, I guess.
