On second thought... You have a short fade distance, thus a short visible
light cone . Try adding a transparent plane not too far in the z-positive
direction :
plane {z, 200 inverse pigment {rgbt 1}}
just to limit the sampling distance. Then, of course, i don't know what your
whole scene should look like, maybe this is not an option...

JYR
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Windows XP HomeEdition//AMD Athlon XP 2800+//1 MB RAM

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