if you go to the last page in a Mobipocket eBook and then page back, it will grab another 64k block from where you were. And the block you have now in memory may not be a 64k block.
Also, someplace on Mobipocket's support site they do say that while you can tell the eBook to use a larger font, that give the way the blocks work, that it's easy to go past it and not have the reader see the font change.
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