I have to insist on this one, as it appears in every scene with glass. E.g.

#include "glass.inc"

global_settings{max_trace_level 10}

camera
{
   location <0,2,-3>
   look_at <0,0,1>
}

light_source {<1,2.5,-2>,  color 1}

cylinder{0,<0,1,0>,1
    texture{T_Glass2}
    interior{I_Glass}
    }

produces a different result as in povray 3.1g (more reflections are showing up). 
IMHO it has to be some bug in lighting.c.

- Micha

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