So I've got this character:

I'm using Mental Ray to render him to get the black outline. I'm also cheating on his eyes by projecting the texture on them and rotating the projection to animate them. The problem is that Mental Ray is not updating the rotation of the projection at every frame in a batch render. I assume this is to give a little more speed to the render, but it looks really bad to have this poor guys pupils pop every 15 frames or so. Does anyone know how to fix this?