The Place Animation did what I was expecting when I tried it... maybe because you used -1? Why would it not work with zero though
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Ahh... don't need the -1
what I had was an image that would continue to a larger image, but only if it were mirrored.
load animation "bg.avi", 1
load animation "bg.avi", 2
play animation 1
PLACE ANIMATION 1,(animation width(1)* 2),0,animation width(1),animation height(1)
play animation 2
PLACE ANIMATION 2,0,0,animation width(2),animation height(2)
If at first you dont succeed, LOWER YOUR STANDARDS.