How are you rendering the final sequence out? Quicktime? Have you enabled the alpha option? Its listed under G-buffers. I only tried alpha's once and I failed. BUT I think what the best way to do this is to enable alpha under G-buffers (in the render room) and then render it as a photoshop Sequence....both the Mac and NT composer should be able to see this. I did a title once but it was a .tif sequence...and the alpha didnt render...I ended up using the AVX plug in "RGB Keyer" and that worked fine but you are correct if you are thinking that that way sucks :) What Kind of Avid are you working with? I will try to render an alpha photoshop sequence this friday and see how it works out....