I know this is an old thread but I seem to be having a problem with MobiPocket. After building the book based on your tutorial (thank you, HarryT!), I got 3 warnings, attached in the picture. Now, these are free books that I have in .zip, and have a book.html with the actual book, book.jpg with the cover, the short description file and a pre-made TOC that I'm supposed to just attach. I already got an .opf to build to book, but the TOC doesn't work, it's greyed out. I'm new to the whole Kindle and MobiPocket thing, so I don't know how to make it work so in the Kindle's 'Go To' menu it shows the correct chapters. Could anyone help me, please?
Aaand I don't know what made this box show up here... is it because of the attachment?
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