what have I done:(

[gosiam]

Hello, I'm architecture student with my final critique very (VERY) soon. I somehow destroyed my light/environemt settings in Vray 3ds max and unfortunately overwrote the file. I've been trying to repair it for a long (!) time now but with no success. Can you please help me with recognizing the problem? I'm attaching 2 renders to compare, the good one is that more transparent one with visible structure. As for the rendering I can see somehow the structure that I want to keep visible while it's building light cache, but then the render is complete opaque. The material on the facade is the same in both cases- the milk glass. Anyone, pleease??