Okay all, I'm stumped here...

I'm working on a DVD right now that has 15 interviews in it. I've put together a lower-third for their names that looks like this (wmv).

What I would like is to be able to render each of these so that I can just "throw them on top" of these people where I want to, rather than having to add a three-track composit for a 5-second effect.

I put it together by parenting a transparent PSD file with white in the lower corner and putting the grapes in a child track, so the grapes show through. Then I put the green stripe & name (again on a transparent BG) above them. If I move these three tracks over a fourth track, I get the desired effect, which is this. Problem is, when I just render out the lower third by itself, everything that is transparent becomes black and it covers everything below.

Is it possible to render this out and maintain the transparency? I really don't want to do it on a "blue screen" and key it out, as that isn't as clean. Have I missed something?

Thanks.