As per the other thread. Hollow glass ball with emitter cranked up wat too high to illustrate the point. Look at the shadow from the table and the light halo around it. I suspect your problem is that you don't have enough transmission bounces for the light to penetrate the shade of your light above. That and I don't know if your fixture is solid, single sided or double sided. That would affect the glass shader you use as well as the number of bounces to penetrate it.