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Sigil failed me, alas! (Kindle conversion)
I have been uploading Sigil-generated epubs to the Amazon store for two and a half years, at least a dozen of them counting both new books and revisions of earlier ones. Yesterday for the first time an upload failed.
In the early morning I'd uploaded a version of this same book without any difficulty. But then I added a teaser chapter from a related book and made a few others tweaks, which somehow changed the epub in some fundamental way. It passed Flight Crew and Epubcheck verification without any errors or warnings, and it was accepted by Draft2Digital for distribution to its various retailers including Apple iBookstore, always the most persnickety. But even on D2D, the Amazon Kindle "mobi" conversion failed, yielding a 500 error. So I don't think it was just a glitch or a sudden change of heart at Amazon.
With great reluctance, I fired up Calibre and used it to convert the epub to a mobi. It checked out okay; I uploaded it; the preview checked out okay; I published it; and now, just a couple hours later, the Look Inside preview is duly displayed on the Amazon store. It looks pretty good, though it doesn't follow my Sigil formatting as closely as do the books I uploaded as epubs.
Can anyone point me to what I (presumably) did wrong, which Calibre was apparently able to do right?
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