Shutter artifacts with motion blur

[mhamid3d]

Using Arnold 4 & Maya 2015.

We're trying to render motionvector aov, so we changed the camera start & end shutter to 0.5. Then in the render settings we have the MB position to 'Start on Frame', with a length of 0.5, and ignore motion blur. For some reason there is heavy artifacts in the render view, everything appears blurred out. When we change the camera start & end to it's defaults (0,1) everything is fine. Only having this problem in one shot. Any ideas?

Thanks

[gshankar165]

I think its the issue with your animation. Can cross check the animation on frame 1001.5(if have animation on 1001 or check 20.5). I meant that check .5 number frames of that frame you want to render.