Problems with anon CVS?

I'm having a few problems getting updates from anon CVS.

Upon issuing the "cvs update" command I get the error:-

Fatal error, aborting.
: no such user

I decided to try a complete checkout so renamed the directory 
and my ~/.cvspass file and logged on again.

mtcc:[/export/home/emkxp01](226)% cvs -d 
:pserver:anoncvs@postgresql.org:/usr/local/cvsroot login
(Logging in to anoncvs@postgresql.org)
CVS password:               <---- entered "postgresql"
mtcc:[/export/home/emkxp01](227)% cvs -z3 -d 
:pserver:anoncvs@postgresql.org:/usr/local/cvsroot co -P pgsql
Fatal error, aborting.
: no such user

So this doesn't help :-(

Anyone else having problems?

Keith.

BTW: cvs -v

Concurrent Versions System (CVS) 1.10 `Halibut' (client/server)