I have a simple object I made by extruding part of a UV Sphere and when I apply a texture with Ray Mirror enabled one of the faces has a strange grainy texture on it. If you do F12 on the following file you will see it clearly (the render will only take a few seconds).
http://uploader.polorix.net//files/1007/cool8-weird.blend
Any ideas what is causing this?
Thanks!