Just FYI, this scene:

//-------------------------------------------------------------

#version 3.6;

background { colour rgb 0.5 }

camera
{
  location  <0.0, 2.0, -5.0>
  look_at   <0.0, 0.0,  0.0>
  right     x*image_width/image_height
}

plane
{
  y, -1
  pigment { checker color rgb 1 color rgb 0 scale <1000, 1, 1> }
  finish { ambient 0.75 }
}

//-------------------------------------------------------------

will render differently in 3.7 vs 3.6, however I don't consider this to be a
bug (at least not in 3.7). You may come across this issue with other patterns
in real scenes if they are scaled severely (like the above).

-- Chris

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