Originally Posted by dgatwood
Adding the following com.apple.ibooks.display-options.xml file:
<?xml version="1.0" encoding="UTF-8"?>
in the META-INF folder appears to fix this problem, so this is probably a curious quirk behavior designed to avoid some problem that the iBooks folks saw with old, broken eBooks.
I would strongly suggest just adding the file. It will save you lots of problems and head scratching.
Thanks for the information. Could you point me please to some source where I can read up on this file?