Did that on the inner sphere, just dropped the marble on ambient for the pano photo. No reflection. But, if I don't make the outer sphere at least transparent, I don't see the pano, just whatever's texturing the outer sphere. Also, if I don't make one of the spheres reflective, how do I (or rather how do YOU) get the objects near the sphere to reflect in it?? When I look at your second example, I see clear reflections. Are those just a part of the map being used?? Can you tell I'm a little confused here??

Could be worse, could be raining.