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The "chapter skip" feature (i.e. being able to jump to next/previous chapter with a single keypress) will only function in the Kindle if an NCX file is included in the MOBI file - it's the navigation points defined in the NCX file that determine what points the Kindle will jump to. You say that your chapter headings are coded H1 and the illustrations are coded with H2 - I'd say it sounds like Calibre is looking for H2 headings to create the NCX table of contents during conversion, except for what you say about the MOBI file working fine using the Kindle Previewer application - I can't figure out how the same file could work OK using the Kindle Previewer, but then do something different when transferred to your Kindle. I've always found the Kindle Previewer to be a very accurate simulation of how a MOBI file will work on the Kindle itself. Are you sure you're sending the same file to your Kindle that you're viewing with the Kindle Previewer?
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