CS6: Strange Artefacts in 3D renders - what is causing this and how to fix it?

Hi all
I am creating 3D renders in PS CS6, and I am getting strange blocky artefacts in the renders. These appear on first pass and persist throughout the render. This has happened in the last 2 renders I have tried - I haven't used 3D for a while before this and I don't remember these before.
By blocky artefacts I don't mean the JPG artefacts created by the forum's degrading of the uploaded image, but the light coloured rectangular blocks around the "s",
On Win7x64 with latest PS CS6 update; NVidia 650M\2GB on a Core i7\8GB.
The attached example follows a YouTube tutorial on creating long shadow icons.
Any advice appreciated!
Thanks
Richard

By the way, it might be helpful for you to show the steps that you followed to get to where you are. 
What you're showing doesn't really look like a typical 3D rendering.  I'm assuming you sheared an extrusion to get that effect, because the type still looks face-on.  You must be viewing the object in Orthographic projection, because the diagonals don't converge.  Have you disabled all your light sources?
Could you put the .psd file online somewhere for others to take a look at?
This is what I'd expect a 3D extrusion to look like...
I didn't use Photoshop 3D before Photoshop CS6, so I can't speak to the level of reorganization made, though I've read the same comments from others.
-Noel

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