Hi Trevan,

That shows up using the "fast" DOF. You'll need to use the Raytraced DOF (RTDOF) to prevent it. 

RTDOF does an excellent job but comes with a speed penalty - It does reflections in DOF and through transparency, the fast DOF does not. It will probably actually be faster to do multiple Alpha masked sequences and combine them in layers in AE. Then you can invoke a blur by layer.

Mark