Confusion while following a tutorial - cat like codings procedural round cube

I have been following some of catlikecodings tutorials and I am confused as to why I am not getting the same result as is supposedly achieved in the tutorial!

I am current up the the ```Rendering A Grid``` section, however, for some reason my materials (even when using the copy/pasted shader and procedural cube scripts) renders black save for a slither of red and green on the bottom left. I have downloaded the finished project and reverted the authors copy to my stage of the tutorial to rule out semantic errors but the result was the same...

Is this the result of something breaking due to changes in unity since the tutorial was authored or am I missing something obvious here?

link to the tutorial: http://catlikecoding.com/unity/tutorials/rounded-cube/