Just for the heck of it, try moving 'normal on' below the function and see if
it still crashes.

~Samuel

eg:

isosurface {
 function { "mesh1" ,<P0,P1,P2,P3,P4> }
         normal on
accuracy  0.001
 threshold  0.02
 contained_by { box { <-10.0, -10.0, -10.0>, <10.0, 10.0, 10.0> } }
 eval
 texture {
 pigment {
  function {
  sqrt(x*x*0.1 + y*y*0.1 + z*z*0.1)
   }
  color_map {
  [ 0.000 rgbft <1.0, 0.5, 1.0, 0.0, 0.0> ]
  [ 1.000 rgbft <1.0, 0.2, 0.2, 0.0, 0.0> ] }  }  } }

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