[jhowell]

Something unusual within Kindle books can sometimes cause the renderer to fail.

The first thing to try is to restart your Kindle and see if that fixes it.

If your book is very large you could try splitting it into pieces and converting them separately. That might solve the problem for you.

If not and you want someone to take a look at your converted book and it is not under copyright then you can uploaded it here.

If the book is copyrighted you can first use the Scramble Ebook plugin to mangle the text and then convert it again. If it still fails on your Kindle you can upload the scrambled version here. (Do not upload a book that is under copyright to MobileRead!)