Expression not being used when batch rendering

[Bart247]

I have a per particle attribute expression that is not being evaluated when I batch render my scene.

The expression tells each particle to change color based on it's distance from the scene origin.
The color is driven by a ramp.
The animation is basically a planet exploding, and the particles are lava exploding out. The lava cools as it travels out into space, hince the change of color.

The expression is a Runtime after dynamics expression:
particle_lavaShape.rgbVPP = mag( particle_lavaShape.position ) / 15;

I added the Vray per particle attribute to my particleShape node and enabled RGB.
Then I connected a ParticleSampleInfo node to my Vray matarial's Self Illumination.

Everything works in the viewport and also renders in my preview window, but...
When I batch render outside of Maya, no color updates, the particles keep the color of the first frame.
I even tried to setup a batch render where it loads each frame individually to see if the expression would be evaluated that way, (below) and that didn't work either.

Batch render:
render -r vray -s 1 -e 1 -cam camera1 -im planet_destruction_lava planet_destruction_lava.ma
render -r vray -s 2 -e 2 -cam camera1 -im planet_destruction_lava planet_destruction_lava.ma
etc...

I also tried to bake the simulation but that didn't seem to work.

Any suggestions on how to fix this or setup a similar particle shader to work?
Will running the expression before dynamics help?

I attached the file.
It loads in a RealFlow particle sequence you will need to replace or just create a new particle system in Maya and apply the shader to it.

Thanks.

[Bart247]

Nevermind! Everything is working perfectly.

I'm an idiot! I was previewing the frames with an sRGB color correction being applied making the color look wrong. When I look at the frames with no gamma correction they look right.

Please erase this tread and save me some embarrassment.