Error 42 is a disk read error. Actually, it's a situation where Mac OS X tells us it's successfully copied a file from the CD but, in fact, it hasn't - the byte count of the copy doesn't match the byte count of the original. We usually see a disk I/O error on the CD/DVD device at the same time as the error in Audiobook Builder. iTunes reads data from the CD in a different way and sometime it works around the issue and sometimes it doesn't. Would you guys mind getting the error to happen again in Audiobook Builder, then creating a System Profiler report and sending it to us at
support@splasm.com?