I'm really don't know the ins and outs of Calibre or epub-ing so I'll gladly defer to the more knowledgeable members
I was only saying I thought there could be a difference between the metadata in the folder's OPF file and the OPF file in the epub based on what I read in the help file for the Modify ePub plug in:
Quote:
Update metadata
Updates the ePub metadata in the manifest (such as title, description, authors etc). In some limited circumstances it will also update the cover as well, however you should instead also check the “Insert or replace cover” option for a more reliable cover replacement option.
Use this option to update the title/author/description internal metadata for your ePub to get it “up to date” for use in the calibre ebook viewer.
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