In fact, these differences seem to be - at least to a certain extent - due
to 'interpretation' of ior in general. In the following scene there appears
to be a marked difference between the results for 3.6 and 3.7beta11c,
visible mainly in the centre of the sphere.

Jeroen.

camera {
  location <2,1,-2>
  look_at <0,0,0>
}

light_source { <0,5,0> color rgb 1 }

plane {
  y, -1
  pigment { checker color rgb 0 color rgb 1 }
}

sphere
{
  0,1
  pigment { rgbt 0.8 }
  interior { ior 1.5 }
}

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