iDVD inserts weird motion blurs
 

I tried to burn a multi-movie DVD with iDVD. Both "Best performance" and "Professional Quality" options resulted in ugly, frequent motion blur distortions in the two disks I tried. Does iDVD stink or what? I haven't learned how to create a multi-movie DVD yet in DVDSP and was just looking to spank something out real quick on one disk to save disks and cases. Any advice?