Quote:
Originally Posted by jackie_w
Your first book is EPUB2 and your second is EPUB3. The first line of the OPF file defines the version. Calibre inserts the correct version of the metadata to match the EPUB version. Perhaps Marvin can't handle EPUB3.
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Marvin claims basic EPUB3 support but from threads I've seen, I don't believe it handles EPUB3 particularly well.