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Matte Material Alpha not rendering

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Hello Everyone,
I have an issue with a current scene I'm trying to break up into passes for comping.  I have an avalanche that is flowing down a mountain side and only want the cast shadow to render.

My setup is:

- shadowmatte material on the mountain obj

- vm matte is on for the pyro obj

- shadowmasks on the lights are * ^mountain


When I render a single image in the render view I'm left with an alpha of my cast shadow, as I would expect.  When I export a sequence from my mantra output to disc I get no alpha.  I've tried jpeg and tiff formats.

Is there a setting that I'm missing somewhere?




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