Certain 'blocks' are not rendering in some frames.

[Namssorg]

I am trying to render a 360 turntable of this Tucker. From some angles, certain 'blocks' do not render, or just appear black, as pictured below.  Usually this happens in areas with lots of vents or perforations.  I've noticed it can happen on still renderings as well as animations.
 

Artifacts on the vents


No artifacts occur from a slightly different angle.

It seems to only happen at certain angles.
Here's a video of what I'm seeing in a 1080p turntable:   http://screencast.com/t/5ZmUwqSHe



Any ideas?  It's not a big deal in the still images, but when these little blocks are appearing in half of the frames rendered, it becomes very distracting.

[Brandon Davis]

Which version of KeyShot are you using?

[Namssorg]

Version 4.0.74

[KeyShot]

Try to increase the anti aliasing level.