From http://www.povray.org/download/3.5-bugs.php
http://news.povray.org/3bb4cf08@news.povray.org

<QUOTE>
// camera in front of box:
camera {location -2.5*z look_at 0}
// light_source behind box:
light_source {1000*z, color 1}
background {color <0.6,0.8,1.0>}
box {
   <-1,-1,0>, <1,1,0>

</QUOTE>

I think this is a case of the 'coincident surfaces problem'. 
It suffices to thicken a little the box and the highlights 
are no more visible.

Massimo

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