After my test, (see pic,) I agree that this should be reported. I never moved the timeline, no keys were generated, yet there is definate motion in my stationary plants! :-0 I am curious about something though... if the rocks/plants are stationary, then why render with motion blur? It creates the frames before and after and during and blends them in the final render, so there SHOULD have to be SOME form of movement for it to see, to generate the vectors to blur. Curiouser and curiouser said Alice...