This relates to the problem with firmware 2.0 on the iPod touch and iPhone breaking playback of some audiobooks. The thread for this discussion is here:
http://www.splasm.com/forum/viewtopic.php?f=13&t=589We have just released Audiobook Builder 1.0.11 that fixes this issue. If you still have the project files for these books, you can simply rebuild the book using 1.0.11, and replace the audiobook on your ipod with the copy you just newly created. For those who no longer have those project files and need to adjust existing audiobooks to work on the new iPod touch and iPhone firmware, we will have a utility available for download on the Audiobook Builder Downloads page shortly.