Quote:
Originally Posted by Doitsu
The test file is a valid epub3 file that passes epubcheck; doing an "ePub to ePub" format conversion with Calibre will cause data loss because, AFAIK, Calibre doesn't support epub3 as the output format.
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My apologises. I'd overlooked that it was an ePub 3 file. It's probably fair to say that ePub 3 support in mainstream readers - with the possible exception of iBooks - is patchy. It would be as well to stick with ePub 2 unless there's some compelling reason to use ePub 3.