Comment 36 for bug 1523291

I can confirm that the workaround in #25 works for me even without step 3.) on my MacBookPro running 10.11.4.
However, Calibre looses a lot of information: around half of the books on my ebook reader are no longer recognized as "in Library" even though they are the exact same version (unmodified) from the library. It looks totally random: even from the same series/collection some books are recognized and some are not.