sounds like a format issue, probably need to change the output settings on the box it might be set to a progressive scan instead of interlaced (i.e. make sure it's in 480i and not 480p or 720p/1080i)

__________________
2006 BMW X5 4.8is Lemans Blue/Beige/Dark Maple
-Nav, Comfort Seats, Heated Steering Wheel,
Rear Airbags, AUX Input
2009 BMW M3 Space Grey/Black/Carbon
-all options