Well, alrighty then! A pretty cool plugin. Calibre developers and Mobileread users think of everything!
I picked a shorter book, so the resulting scrambled file is smaller. I hope it is small enough to not run afoul of any forum rules on upload size (you'd think the website user interface for uploads would automatically enforce size limits).
I still think it's probably something peculiar to my setup, and not the ebook itself (since they ALL exhibit the behavior for me, and none do for kovidgoyal). However, attached is one such book that I manually verified as exhibiting the problem.
In the attached EPUB, jump to page 200 by overwriting the progress field in the upper left of the viewer. You should see a line that starts with "USU HBKP". And you should see that the text does not wrap.
Next, drag the scrollbar on the right up and down a bit randomly, then click outside of the scrollbars drag handle a few times, then drag it some more, then click some more until you see the text wrapping start to work again. Then drag the scrollbar back to where you see "USU HBKP" again. This is on page 197 at this point, not the page 200 it was originally found on. Now, you should see that the text is wrapping appropriately. The attached screenshot shows the book at the end of the test described above, when the text is wrapped appropriately. I forgot to take a screenshot of the no-wrap error condition (and have since deleted the scrambled book from Calibre).
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