Cant Get Light To Pass Through Glass

[georgep1]

I have a scene where a spotlight with a physical light attached is shining into a room through a glass window that is made of two surfaces. I have the l_glass shader attached to both surfaces. I am using global illumination, but I cant get light to pass through the glass. It seems as though the glass is allowing the photons to pass through because the room is partially lit, but there arent any shadows. when i render the scene without the glass window everything looks good and there are shadows. I have my refractions turned up to 8 on both raytracing and global illumination and my shadow trace depth turned up to 4 so i dont think that is the problem. I tried turning on caustics but that did nothing, although I am not emmitting any caustic photons because I didnt think I really needed any for my scene.
For now I am going to try assigning the mib_shadow_transparancy shader to the glass surfaces' shadow slot, but it doesnt seem to me like this is the correct way of solving this problem. (if it is please let me know). How do I get light to pass through the glass?
Thanks in advance

[joojaa]

there are 3 places that limit ray casting.

each individual light have a max ray depth value

This max is clamped by global max

And that max in trn is clamped by the materials max refractions

A

[georgep1]

thanks, but where would i find the materials max refractions on l_glass for example? I cant seem to get shadows to pass through this without assigning the mib_shadow_transparancy shader to the shadow shader slot.