Quote - Texture size as opposed to CR2 size, I would bet that is where you're having problems.

I guess it could be that, though I think the V4 Basic out of the box doesn't even really have any significant texture mapping; but I could be wrong and should check into that.  Thanks for the ideas. 
It occurs to me the other strategy would be to abandon Point_At at least for now.  The morphforms dials for the eye movements are pretty cool actually, given that they make the eyelids move in a corresponding fashion (e.g., eyelids come down when the eyes point downward).  Maybe a python script would be possible which would modify the morphform dial so that a camera or other object can be tracked.