Hasta La Motion!

I’m having some trouble and hoping you guys can help me out. I am running into a problem where I have two fluid fx simulations going for a volcano scene. One is the ash coming out of the volcano, the other is the lava. I cached out my fluids fx, but when I go to batch render it says that it has completed rendering after a few sec. It’s 150 frames at 30fps. I tried the following steps to no avail

1. Optimizing Scene Size
2. Creating each fluid on its own layer
3. Importing the file into a new Maya scene.
4. Recreating a Camera and copy and pasting the keyframe (I only have one key set for my camera so I won’t lose the place of where I want it to be rendered from).

Also can you please give directions on how to render from Terminal on a Mac. I know its something like _mr and then the path which I can just drag and drop the actual file into.

Thanks for the help.