Well ... similar problems are well known to webdesigners. A standard conform website will not be displayed correctly on Internet Explorer 5,6,7 (8 is better though). This is a problem with the Internet Explorer - not with the standard or the page.
Nevertheless: The webdesigner/layouter/programmer will have to take this problems into account and code a page that will be displayed correctly on FF, IE, etc
Well ... webdesigners do this for years - and you want to let publishers get away with it? "There's buggy software that does not display ePub correctly. This is not the fault of the publisher" - it is. Because it is their job to TEST the eBook - and testing means (among other things) trying to display it on available platforms (e.g. Sony Reader) and making sure, that it displays correctly.
Not testing this is comparable to printing books, binding them - and forgetting to check (even once) whether the cover really contains the correct pages.
But I agree - ePub is not an ideal (or even good) standard by miles - still better then most alternatives though ...
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