I thought I use the weekend to learn some blender. Unfortunately I have some trouble with shading. Maybe someone can explain it to me. I added some loops and a Simple Deform modifier to the standard cube.
The rendered image looks somehow weird. See the picture below!
The first cube is with flat the second one with smooth shading applied. Using the openGL renderer I get the result I expected.
Is it known issue or normal behavior? I already tried to set auto smoothing groups, recalculated normals outside and removed doubles, which did not change anything.
I am using a Mac (OS X 10.8.5) with a blender built from Graphicall.org (Hash 70f2389). It is the same with the official built.