I'm having issues with spotlights and emmiting media where I get black 
dots in the media with a spotlight.

If I comment out the spotlight line then it renders fine.

I was messing about with lightsys but eventually simplified the scene to 
this. I don't really need a spotlight but was wondering if anyone could 
cast any light on this?

-----------
light_source{ y*30 color rgb 1
   //comment out the following line to get it to render ok
   spotlight radius 90 falloff 90 tightness 1 point_at y*-1

}

camera {
   location  <0, 2, -2.0>
   right     x*image_width/image_height
   look_at 0
}

plane {
   y, -1
   pigment { color rgb 0.5 }
}

sphere {  0, 1
    hollow
    texture {
       pigment { rgbt 1}
       finish { ambient 0 diffuse 0  }
    }
    interior {
       media {
          intervals 3
          emission 0.5
          density { spherical }
       }
    }
}
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