Among other things, Skeety saw fit to write:

>  Anyone know why a flame (texture/material defined with media) will show
>  up
> perfectly with nothing (black) in the background...but as soon as
> I put a wall (plane) behind it...the flame disappears?
> 
> I've verified that the object is in front of the wall...but not sure why
> the wall makes it disappear.

Maybe you have your plane inside-out?

Add "hollow" to the plane definition or invert the normal (i.e. if you have 
{plane z, 1} change it to {plane -z, -1})

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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