I've not used that software for DVD's before so I can only speculate but my first guess would be that the resulting NTSC comes out larger than 4.7GB and so the programm is failing. How big is the final Pal DVD in GB?
A project I am on at the minute - the pal version comes out at 6.9gb- - the NTSC is 7.8gb Its not always going to be bigger jus sometimes.
Check ur software to see if it will allow u to change the disck size from 4.7 to 8.5 and try it.
Strictly speaking though - you should really encode all the assets as NTSC before the author a new preojsect with the NTSC assets.
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