Problem with Combustion's Smoke Particles

[Chasteen]

I'm having problems with semi-transparent particles being placed on a layer other than the same layer as the background footage. Below is a cropped screen capture image of my viewport and workspace.

 

 

Shoot Smoke 1 is on the same layer with the green background and it looks great (just like it should). Shoot Smoke 2 is on a separate layer placed just above the layer containing the background. It should look identical to Shoot Smoke 1, but as you can see being on a separate layer from the background creates problems for the semi-transparent part of the smoke. If having a cws file makes it easier for someone to help me I've included a link just below to a zipped c3 file (for compatibility even though I use Combustion 4). If anyone here thinks they might have a solution I'd love to hear it.

 

http://www.dc-studio.com/posts/SmokeProblem.zip

 

Additional Details:

Both the help files and a couple of Combustion books suggested placing emitters/particles on their own layer as a way to provide easier control for more complicated animations of emitter/particles.