It gets even weirder. I've discovered that the problem occurs on both of my Kindles and both of my Kobos. I copied my database from my Mac to my Windows machine and run calibre on Windows, and the problem persists. The only difference I've noticed is that the Mac version says I have 7249 books in the database and the Windows version says 7149. But with a blank Search field on the Kindle/Kobo and doing a Search, they both stop listing books at one particular book. I have deleted that book and the one before and the one after and restarted calibre. After a restart, all three of those books still showed up in the list on the Kindle and the Kobo, but both were no longer in the calibre (6.10) database. I'm using the mobile view on the Kindle/Kobo, as the alternative does not load on either of these.
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