Refractions turns object black. Mental Ray

Hi all,

I just set up a glass shader which uses a HDRI for lighting the scene a ramp which controls the transparancy and the material itself is a blinn. I render with mental ray, Raytrace, Global Illumination and Final Gathering turned on. It renders fine when I have refractions turned off in the blinn settings. But as I want to render a glass I need refractions. So I turned it on and the glass is almost black…

Find some screencaps attached.

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