There's a bug in CSG rendering. This scene demonstrates it clearly
(compare it to 3.6.1):

camera { location -z*10 look_at 0 angle 35 }
light_source { <100,200,-300>, 1 }

difference
{ box { <-1, -1, 0>, <1, 1, .1> }
  union
  { cylinder { <0, .5, -.1>, <0, .5, .2>, .75 }
    cylinder { <0, -.5, -.1>, <0, -.5, .2>, .75 }
    inverse
  }
  pigment { rgb 1 }
}


-- 
                                                          - Warp

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