Freestyle animation has delay in cycles When rendering my scene as an animation, on particular frames (in this instance, 17), I often get a delay in the outlining, like it's trying to outline the next/previous frame.  

This doesn't happen when rendering the frame normally - as in not an animation.

It looks like this:
When animated  



When rendered normally



It's like the actual render is delayed by a frame, but only when animated.
Is this a known bug?
I found using cycles and freestyle so slow (like minutes) that its easier to clone the project file, then replace all the cycle materials for a simple diffuse transparent BI material and run it with BI.  Then composite the frames with the other rendered frames. Of course, I have thousands of polys so it may not help if the model is low poly.