Yep, kills my Oasis as well, so I had a bash at your book in the editor; fixed errors shown in "Check Book", got the zillion footnotes into one file, etc., etc. No luck. Can't see anything that looks wrong. Like Kovid says--major experimentation to figure it out.
You might take a working mobi copy and try converting it back to azw3, and if that works, do a little editing to pretty it back up...but that could be a lot of work.
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