Thanks for pointing that out, however, billboards don’t work either. Even though I can view the particle size changing in the viewport, it does not render the size change for a particle with halo enabled (boo hoo).
As I write this I am trying different material settings, like turning off halo and using the default material, and it looks like you can’t render the size change, only preview it.
Anyone else have any luck with that?
Ah, I stand corrected, billboards DO work, it seems that once I disabled halo, the particle system would not let go of the material. I applied a new material and it started working.