Yellow Pages Error?

[simpson at trwarcadia.uucp]

Sun OS 3.5. No source license.

We are apparently having trouble with our yellow pages.  Occasionally the
system will get into a state where ~ expansion won't work!  Say I am in
my home directory and I execute the commands
	% echo ~
	/minotaur/simpson
	% echo ~config					# No output!
	% cat ~config/.cshrc > /tmp/the
	cat: write error: Bad file number		# Huh?
	%
	...execute some more commands...
	% echo ~config
	/usr/arcadia/config				# Now it works!

Does anybody else have this problem or know what is happening?
	Scott Simpson
	TRW Space and Defense Sector
	oberon!trwarcadia!simpson  		(UUCP)
	trwarcadia!simpson at oberon.usc.edu	(Internet)