Thanks to everyone who helped.  (Although I didn't respond to your
requests for more information, I did use them as clues as to where to
look.)  And while I'd checked the paths about a thousand times, the
"ONLINE" parameter to UPDATE PATH seemed to escape my notice.  :)

Perhaps a more informative error message, indicating that the issue is
a software setting rather than a hardware failure might be in order for
a future release?

--
Jason A. Specland
Unix Administrator
Weill Cornell Medical College, Office of Academic Computing
jas2005 AT med.cornell DOT edu