For some reason, when I try to open books downloaded from AO3 by FFDL on my kindle, I keep getting and error message saying "The selected item could not be opened." Removing it and re-adding it doesn't work. When I try to open the same book with Kindle for Mac, it works fine. I can also get it to work if I re-convert it with Calibre. I haven't checked all of my books, but it seems to be happening only with books I either downloaded recently, updated recently, or accidentally tried to download recently (where I entered the URL, and the program told me that I already had the book). Is this a PEBCAK error of some sort, or is it a bug?
One of the books giving me the error: http://archiveofourown.org/works/296762