If you change the
 pigment{ rgbf<.5 .5 .5 1> }
in the water to 
 pigment{ rgbf<1, 1, 1, 1> }
the shadow will not appear. This probably has something to do with the 
reflection balancing features, which make a more physically correct 
image.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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