Have you seen these warnings from DVD Studio Pro when you go to burn a DVD or write a DLT :

"Warning: The file ‘MyProject.layout’ found in the VIDEO_TS or
HVDVD_TS folder will not be included in the final disc."
...and:
"Warning: The file ‘VOB_DATA.LAY’ found in the VIDEO_TS or HVDVD_TS folder will not be included in