Quote:
Originally Posted by davidfor
OK, the only other times I've seen something like that is with books with errors. You can get some fun things happening if the ToC does not match the internal structure of the book. If there are errors in the code of a page, then you can get empty pages like you describe. Checking the books with ePubCheck or the checks built into either the calibre editor or Sigil should show this.
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Chiming in to endorse this answer. There are positively loads of books on the market where the navigation TOC (the .ncx file) is messed up, or the code is so bad that chapters refuse to render in the Adobe engine.