Strange flicker on export

[Shaw]

Hi guys,

I'm working on keying some footage for a friend. When I try to export the footage a strange flicker pops up which was never there in the preview. I'm quite certain it's not a matte issue or a matte edge issue. Here's a grab to demonstrate what I'm talking about:

Right now I have three layers: the background, a girl on the left and a girl on the right.

Anyone have any ideas?

 

[surf]

are you sure about the layers you have keyed?

I have never had this problem, although I have already made a lotlotlot keying. have you tryed to use a different file format?

you shouldn't have cut that picture...

 

[Scottdvx100]

Go to same frame in preview at 100% full quality. Is it there? When playing back in preview you may not see every frame.
If it's there toggle on and off you're layers to pinpoint it.