Mental ray and scene problem

I have a problem with the scene.

First i tested if my MR is forking fine. I made simple scene with a (polybox room) and nurbs sphere with lambret assign too it. It renderd GI in MR easy as nothing.

But then i have a problem.

Another scene from nurbs polys and trimed surfaces, with various shaders assign to them didn't work. When i wannted to us photon emmision and GIb in MR tzha maya crashes without warning .

Please what is wrong i need answers.