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Checked it out with Sigil's epub validation - it doesn't like the fact that the SVG cover is a child of body (though that's not exactly the error give). Wrapping the cover in <div></div> tags removed the error.
No idea if that's the cause of the crash (don't have a nook), but it's a simple fix if it is.
Sigil/Flightcrew also threw warnings (not errors) that the fonts and background images were manifested but unused. They are used, but in the css instead of the html. I'm not sure if that's a Flightcrew issue or if the use embedded fonts/images in css in that particular manner isn't officially blessed.
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