Problem with ice while rendering with Final Gather

#1

Hi there I have a trouble with rendering ice particles with final gather.
When i use mental ray with out fg is ok but when fg is on i have transparent cubic border of the particles.
I use particle volume with particle density node. I have try with ice particle volume to but the result is the same.
This is the situation

http://viewmorepics.myspace.com/index.cfm?fuseaction=viewImage&friendID=183633271&albumID=2215756&imageID=40751151

#2

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