I have an ICE simulation that uses a shape instance as the particle.
The simulation renders fine without motion blur, but when I apply motion blur to the render the simulation behaves (or renders) strangely.
I have reduced my instance to a simple sphere and have had a few times where it will render correctly, but if I have a glow attached to the sphere instance, or use a more complex instance the same event happens.
My simulation starts without any motion, renders fine.
When the particles instances start to move, the rendered frames do not match the simulation.
Not sure how to describe it, but as soon as the motion starts, it appears the particles just try to exit the frame.  The movement does not match the cached simulation.

I can go to any frame and region render in my camera viewport, and it renders correctly.
Region settings and render manager settings are the same.

Any help is greatly apprecitated.
Thanks