Sorry for the repeated replies. POV had crashed and took the newsreader with 
it so I didn't think it got sent the first time. Only now getting back to 
giving POV beta 15 another look again.

Reason for the crash-- or, rather, more like a soft crash-- was apparently 
due to pretrace_end value being too small. I was trying to make changes to 
the pretrace to see if it had any affect, the render stalls and eventually a 
runtime error is displayed after closing the program.

I believe this is the same pretrace problem (pretrace_end less than 1 pixel) 
reported at:

http://news.povray.org/povray.beta-test/thread/%3C443034c9%241%40news.povray.org%3E/
or
443034c9$1@news.povray.org

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