I agree about the fogging issue. Wellm partly. On my old laptop, it happened with fogging full stop. On my GeForce2MX it only happened when I added the layers. On the GeForce4 it doesn't happen at all, so I expect you're on the right track there.
I think I'll try and recreate this effect in a short, simple program. I bet it doesn't happen then. Grrrr. :D
I think I'll try and recreate this effect in a short, simple program. I bet it doesn't happen then. Grrrr. :D