Thanks for your interest.
Unzipped, it looks normal. It re-loads into Sigil OK. It reads OK in Aldiko on my Nexus 9. It reads OK in Calibre.
But ADE doesn't like it. Sometimes. Then I mess with it again in Sigil, and ADE accepts it. But I can't see any pattern to WHAT edits make a difference!
I wouldn't worry. But customers check my work in ADE (and Kindle Reader) on their computers. Realistically, I have to optimize for those readers.
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