I am getting a strange horizontal stripe with rendering a curved surface with a wooden material applied by using the Cycles renderer. The picture below basically tells it all:
I've uploaded the Blender model here: The Blender model for reproducing the problem
As far as I can tell, there's nothing wrong neither with normals nor with the geometry itself at the location where the stripe appears. Nor does it seem to be a texture mapping issue since if I switch to the "textured" display in the main editor pane, the stripe goes away and I can see the texture mapped exactly the way I want.
I've also played a bit with the node editor for the material to check to see if there are certain nodes that could contribute to this strange effect, but to no avail :(
Hopefully someone experienced from the community could give me a hint what's going on since I seem to be out of further ideas to try.