RESOLVED - finally figured this out. I was running a custom version of the N770 OS. Reverted to stock, and Calibre now detects my 770 again. It didn't occur to me to check this because the old detection method didn't have a problem with the "hacked" OS. Just FYI in case someone else has this issue.
You also might want to consider updating your detection signatures to allow detection of the OS, or have them detect based purely on the hardware id, if that's possible.
Another idea I had was maybe you could make an option to tell calibre an arbitrary mounted drive is a reading device, and tell it where you want it to sync your books.
Anyway, thanks for your help on this.
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