The renderer quits unexpectedly with usch errors as "Parse Error: Cannot open
input file" and "Unknown internal error!". Eventually, if you keep trying the
scene will render, but it may quit again on the next frame in an animation.
This issue is discussed at greater length here:
http://news.povray.org/povray.general/thread/%3Cweb.493a64ae15bf06cba19b81b0%40news.povray.org%3E/?mtop=18
-Mike
