Light not coming through glass in night scene

[Stereoscopic...]

Hi everyone... this is my first tech post and I'm hoping that you can help me with what I think may be a basic problem, but one which I cant seem to find an answer to. If you check out the attachment, I'm doing a night scene of a shopping mall. I've got lights in the posts of the canopy (which I've turned down to highlight my problem), and lights inside the shops. I'm trying to get the lights inside the shops to shine out onto the walkway but the light appears to be coming out of the frames or something! The windows and frames are modeled from planes that have been inseted and beveled, and I'm using the Thin-Walled option in the A&D glass material. Anyone have any ideas?