ATI Radeon HD 4670 256 MB
Mac OS X Lion 10.7.5 (11G63b)
Yes there are a few open gaps (intended, can be filled by "black videos" obviously- will that help?).
No third party effects.
Several effects have been applied. Too many to mention ("transform", "mirror", color changes, contrast changes etc).
I can render and export each nest separately. I think the encoder "gets overwhelmed" when it has to read the whole project (which is why I think it will be useless to try to get a proper result with my current system). Thanks