Question re: Vegas Video about alpha channel

I didnt want to layer codecs while doing a greenscreen layer. The problem I notice in vegas 6 is that if I render in uncompressed format avi or strangly enough in mpeg, all I get is a black and white matte of my video (black background and white subject).

whats happening? I tried everything in vegas. I tried the alpha or burn or any of the number of render settings, I can not find how to turn the matte off.

Anyone know what Im talking about? It happens in Adobe AE as well.

It works fine if I use avi with cinepak codec or one of the other codecs but if its just mpeg layer 2 or avi uncompressed it shows matte.

And there is no alpha setting in poser 4 which is what Im using to make a character with.

input!
 
I've been importing and exporting with the .PNG extension, uncompressed with alpha channel turned on.

I don;t remember if Vegas allows PNG.. I believe it does.
 
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