After about seven hours of saving individual sections to pdf’s, fixing the broken links, changing all of the “Chapter 1” headings to the proper chapters and sections, and stitching them back into whole chapters and a book, then I saw the error. The LaTeX for the division box did not translate.
I tried resaving pdf’s – no go on that. I ended up having to view the file in the FlexBook Reader and take screen shots. I copied the division problems as graphics and pasted them into my pdf’s. That was annoying.
Remind me – why didn’t I just order textbooks? The good ones that I have used have plenty of interactive elements, videos, and tons of resource materials. This CK-12 experiment is not looking so good.