Don't know if this has been reported, and I don't know if it is a bug or if
I'm just doing something stupid, but the following code only renders a
portion of the sphere unless you move the camera.

I'm using 3.1g wmp 05a (windows).

#version unofficial MegaPov 0.5;

light_source{<0,0,0> color rgb<1,1,1>1.00 translate <-20000, 20000, -20000>}
camera{location  <1.0, 1.0, -4.0> look_at <0.0, 0.0,  0.0>} //  not okay
//camera{location  <1.0, 1.0, -6.0> look_at <0.0, 0.0,  0.0>} // okay

#declare isoSphere =
isosurface{
  function{x^2 + y^2 + z^2}
  threshold 1
  sign 1
  accuracy .001 eval method 2
  contained_by{box{<-2,-2,-2>,<2,2,2>}}
}

object{
  isoSphere
  pigment{rgb 1}
}

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