Hi all,
whilst changing an old scene to work under 3.7 I found a funny.
Have narrowed it down to the following.

using following code all is well and as expected, however if you change 
the position of the plane to +2 you lose the sphere ???
Am puzzled as to why.
Can use workaround of making image_map with negative plane and then 
rotate it 180*y

Is probably my understanding of things
			... Bob

plane {
   z, -2
   texture {
     pigment {
       image_map {
         png "test.png"
         interpolate 2 // smooth it
         once   // don't tile image, just one copy
       }
       // transform it to unit-size (-1 to +1)
       translate -0.5*(x+y) // center on the origin
       scale 2              // make it unit-sized
     }
     finish { ambient 0.3 }
   }
}

sphere { 0,1 pigment { rgbt 1 }  hollow                    // 
transparent sphere containing media
                              interior  { media { emission 20
                              density  { spherical density_map {
                                         [ 0 color rgbt <1, 0, 0,  1> ]
                                         [ 1 color rgbt <.9, 1, 0, -1> ] }
                          }   } } }

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