I'm using POV v3.6.1c.icl8.win32, WinXP SP2.
I created a scene and put a simple sphere-sweep object in it.
There is a strange artifact only appearing on its shadow, not the object itself.

This is a simplified scene which is enough to show the problem:

#include "colors.inc"

camera {
  location  <-1.5, 0.3, -2.2>
  look_at   <-0.4, 0.3, -1>
}

light_source {
  <0,0.3,-3>
  color rgb White

polygon {
  4,
  <0, 0>, <0, 1>, <1, 1>, <1, 0>
  pigment { White }
  translate x*-0.5+y*-0.3
  scale 1.8
}

sphere_sweep {
  linear_spline
  2,
  < 0, -3, 3>, 1
  < 4, -5, 0>, 1
  pigment {Yellow}
  scale 1/20
  rotate x*-50
  translate -1.5*z+y*0.3
}

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