Smooth shader and subsurf shadow problem As you can see in the pictures I made a mesh and added loopcuts to it for the smooth face shading that it's using but there is an undesired shadow, which isn't seen from higher angles. When I apply subsurf it also gives a shadow but only on half of the selection...

without subsurf (just smooth face shading):



without subsurf (just smooth face shading) from different angle:



With subsurf:





file:
Some of the normals are incorrect. Select everything in edit mode and press Ctrl-N and that will recalculate the normals and fix it.