Sorry, but I think twyst is right, it is a 
coinciding surface-problem, his solution is just not quite right. 
Try this:

 // The 'L'
 union {
  box {<0,0,0>, <1,9,1>}
  box {<0.00000001,0.00000001,0.00000001>, <6,1,0.99999999>}

I can't get the white snow-effect you described on my copy of POV
(x-povray 3.02 for UNIX) but I do get a coinciding curface problem, making
the corner itself completely white and the edges of the corner 
red-speckled. Very strange effect.

Best if luck :)

/Michael

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