It's all in the vertex normals ..
I don't know if these follow up aggrevate people or not, if so then let me know.
Anyway, I was getting the rounded edges on my cube object when I rendered and it all went back to the issue of vertex normals .... any package I used before just had face normals, which maya also does, but no vertex normals to worry about.
Anyway, I had selected all faces and did a normal average, which had eliminated all vertex's that had more than one normal including the corner vertex's. What this did was create rounded corners. I fixed the model and vertex's and have attached an image showing what and why. Hope this helps someone else in the future.
Well, I guess that about covers vertex normals in my life .......