Apple has released DVD Studio Pro 4.1.1 which “addresses an issue with disc layout for DDP and CMF images on Intel-based Macintosh computers.”
This update is recommended for all users of DVD Studio Pro 4.1 and later.
• Mac OS X 10.4.4 or later
• DVD Studio Pro 4.1
More info and a link for the 2.3MB Update can be found here.