Materials: Can't change density in volume

Nothing happens when I try to change the density in volume. I need to set it clear down to 0 for smoke simulation. When I try to render it, blender locks up and I have to force it to close.

Is this a known issue? I did not see anything in here about it.

I’m using blender 2.62 on win7

Was it crashing before you set the density to zero?

no it wasn’t. it’s only after the density is changed.

Okay, I downloaded the latest version of Blender and that fixed the problem