>but... this is still a mystery to me, because I know I didn't specify
>ANY global_settings in the scene file yesterday, and POV-Ray still
>produced garbage; today I tried again (I didn't make any changes) and
>these black squares were gone! The only explanation I can imagine is
>that POV-Ray crashed (which happens under Windoze95 quite often) and
>after restarting POV-Ray it got a bit confused and somehow used a
>wrong value (6 or 7?) for max_trace_level!?

  Hi, Daniel. This was a known bug and has been fixed since POV-Ray for
Windows v3.1d (we are now at v3.1g). As per Changes.txt that accompanies
POVWin:

o Fixed MAX_TRACE_LEVEL global not being re-initialized.

-- 
Alan
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