additive-projector not looking good on iPhone

I am applying the additive-projector prefab to a box in my iPhone game, in unity it looks good ( like a glowing colored shadow) but on the device, with the compiled project, this does not appear... Am i missing something?

Thanks!

I don't know if this addresses your problem, but the just-released Unity iPhone 1.5.1 has an additive-project bug fix: http://unity3d.com/unity/whats-new/iphone-1.5.1