When using the new ambient occlusion light together,
you get the wire frame mesh to show up in the render.

To recreate the error:

Start blender, move the camera inside the default
cube, pointing at a corner.
Select the lamp and change it to ambient occlusion,
use distances on and set to about 2.
Go to the render buttons and select motion blur.
Now render and observe.

It's a nice effect, but not as it should be.

Have fun,

Wybren van Keulen