I don't seem to be able to render photon caustics in a media container at
all.  With both turned on the caustics diappear, the media disappears in
the shadow of my transparent object, and shadows go completely black.  With
only media turned on media works just fine with proper shading in the
shadows.  With only photons turned on the caustics work fine.  I all cases
in internal diffusion works.  I have spent hours with the documentation to
no avail.  What am I missing? Here are the settings I last tried:

global_settings {
  assumed_gamma 1.0
  max_trace_level 15
   photons {
     count 20000
     jitter .4
     media 300
     max_trace_level 35
   }
}

In my object's interior:

  interior{
    ior 2.2
    dispersion 1.9
    dispersion_samples 120
  }

My objects' photon block:

  photons{
    target
    reflection on
    refraction on
  }

My media container:

cylinder{
  <0,-.01,0>,<0,14,0>,8
  texture{
    pigment{ color rgbt <1,1,1,1>}
  }
  interior{
    media{
      scattering { 1, rgb 0.03}
      intervals 1
      samples 30,100
      method 3
    }
  }
  hollow
}

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