Planet/Atmosphere shader problem.

Hey guys! I tried using the planet shader from the unity wiki, but instead I got this :

I'm currently using unity free. Also, directional lights/point lights doesn't seem to affect the shader in any ways. And when I move the camera around in game view, there seems to be artifacts forming around the ring section. This appears to only happen in game view. I know this question has been asked a lot of times, but still no hopes after trying to wrap my brain around it for the whole morning. Tried fiddling with light intensity, all the shader settings, still no hope. How do I remove this "ring" effect and get it to work with directional lights as it is supposed to? Thanks!