Now this is weird. From the render I can see you use Infinite, could you tell us which version you're using? Built & patch? The only idea that comes to my mind is that in the render settings, "enable sub rays" is disabled, thus not computing reflections. Which quality did you render this sphere? Was it the default "preview" or was it "sketch"? If the latter, it's normal, sketch doesn't compute reflectivity or transparency. If it is something else, I'll let wabe help!