Object are showing black in material view I just successfully rendered this clock tutorial. However all of the objects show black in material view. I've been searching online for an hour, found a lot of similar posts but none of the answers match my setup. I have out put nodes, im not in local view, and the light source's specular and diffuse options are checked. Can any one help point me in the right direction?

Example

(Link to my blender file)

Update:  I've been using my laptop for this project - a dell Inspiron - and recently opened the project on my main pc and selected my nvidia gpu for the hardware. For whatever reason the materials show fine. I think its related to the Intel Intgrated HD graphics on my laptop. Must be some kind of driver glitch. The bottom line seems to be that my laptop's integrated graphics don't work well with this aspect of Blender. Thanks for all the help though.
You may have a flipped normals. If you swap into edit mode and select one of its faces then ctrl-F to get your drop down and select "flip normal" may help.