Originally Posted by DiapDealer
re-wrap"' in all the <body> elements needs to go. Chuck it right out. ADE seems to be ignoring it for the most part (line-breaks), but Sigil's QTWebKit renderer doesn't. It's showing every line-break that Sigil's pretty-print feature is adding (Code View). I assume the ridiculous amounts of whitespace might show up in iBooks, too, since I believe it uses a WebKit renderer as well.
This was the culprit.
Thanks all very much for your help and suggestions.