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Please keep the following pointers in mind. Adobe has no epubchecker (it should have one though), there is the opensource ePubCheck and the opensource FlightCrew.
Tell your designers to learn basic XHTML and CSS, that is really invaluable when handling ePUB's.
That said, it does belong in the Calibre subforum. You were right. I vaguely recall someone mentioning it before.
A possible solution: Open the file in Sigil and save it again. While your at it, run the validation in Sigil too. It is better than the ePubCheck.
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