Thank you all for your help.  I found the error, and it's one of those where
I will be kicking myself for weks now for not noticing earlier.  It is, as
you said in one of your earlier posts to this thread, Warp, permissions.  I
had initially rendered this file while logged in as su, and I didn't delete
the output file.  Therefore, when I run it logged in under something else, I
couldn't alter the output file.  Thank you again for all your help
everyone!!!

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