The lines in my previous post are wrong. I don't know the correct line 
anymore, so I just post the context:

isosurface.cpp
"
    /* change the sign and go into the isosurface */
    }
  }
 
  //remove this line:
  //Thread->isosurfaceData->current = this;
  Thread->isosurfaceData->ctx = Thread->functionContext;

  for (; itrace < max_trace; itrace++)
  {
"
and later on:
"
else if(!in_shadow_test)
{
  itd.cache = true;
  VEvaluateRay(itd.Pglobal, PP, EP1.t, DD);
  VEvaluateRay(itd.Dglobal, PP, EP2.t, DD);
  //add this line:
  itd.current = this;
    
  return false;
}

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