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AH-hah...
I remember what it is.
It's the media queries AROUND images. The KF8 and KF7 image coding.
When we made ePUBs with the kf7 hidden and kf8 hidden images and used the two different sizing methods--pixels for KF7 and % for KF8, the files started getting totally bollixed in real devices.
If memory serves--and I'll have to go look--they did pass ePUBcheck, but on real Nooks and stuff, it wasn't a pretty picture.
(But, yes, somewhere, and I'll pull it out of these crusty old brain cells somewhere, there WAS an ePUBcheck crash and burn...)
Hitch
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