The ID's I'm getting are a long series of numbers and letters. Here is the line in the content.opf that is causing trouble:
<item href="Text/cover.xhtml" id="57ad97cc-957c-4506-9238-172641322ada" media-type="application/xhtml+xml" />
If I change the id to something that starts with a letter, ie. "a7ad97cc-..." then it passes the ePub verification.
If Calibre happens to give it an ID that starts with a letter, then it will pass without any issues. I don't remember that happening a few months ago when I last used Calibre. If I look at an old ePub, it has the cover line written much simpler:
<item href="Text/cover.xhtml" id="cover" media-type="application/xhtml+xml" />
Am I missing something/doing something wrong? Thanks for your help.
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