--- Operating System, Graphics card ---
win7 x64, lenovo y580, intel hd 4000

--- Blender version with error, and version that worked ---
trunk msvc r57101

--- Short description of error ---

Flat shading is black when using screw modifier with 'calc order' after mirror modifier.
also...
...maybe it would be helpful to know that edge split modifier don`t work correctly after those two but adding it fix shading issue

--- Steps for others to reproduce the error (preferably based on attached .blend file) ---

just see the blend for real world example