I don't know if this is relevant, but just in case...
I've put a post on the ePub forum about an ebook I designed myself which I know validates and which works on my Sony, my Kindle3 (after conversion) and on my iPad/iBooks but which does not work when side loaded into a friend's Kobo Touch.
Is it possible that the original poster's problem and mine are caused by the Kobo Touch?
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