> Please provide a _short_ example.

Odd, I'm not sure what's going on here.
Try the following scene, the camera is not inside the box but is inside the
sphere

1) as is, the scene gives an error even though the camera is inside the
sphere and the sphere is 'hollow' and not inside the box.
2)comment out just the sphere and it's fine
3)comment out just the box and it's fine
4) add 'hollow' to the box and it's fine (the camera isn't even in the box)
5) move just the box outside the light group and it's fine
6) move just the sphere outside the light group and it's fine

hope this helps

-tgq


//start
camera{
  location <50,30,50>
  look_at  <0,0,0>
}

light_group{
  box{<-300,-30,-120> <300,-5.5,120>}
  plane{-y 0 hollow}
}
//end

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