Problem with admin privileges

[Julian Opificius]

I just instigated admin controls by opening up and configuring the 
UserAdminOptions setting.
My account is a member of Linux "cvsadmin" group, yet like 
non-privileged users I cannot execute admin commands.

my error message is:-
"cvs [admin aborted]: usage is restricted to members of the group cvsadmin"

Yet as I said, I am a member of that group.

What am I doing wrong, please?

My config is as below, and general access works fine.

cvs-1.12.9-2.2 on Suse 9.2
wincvs 2.0.0.2 via :pserver: tunneled through ssh (PuTTY)

$CVSROOT/CVSROOT/config contains:
SystemAuth=yes
UserAdminOptions=km

$CVSROOT/CVSROOT/passwd file entries look like this:
user_name:<password>:cvs

all cvs repository directories & files are user/group cvs:cvs

/etc/xinet.d/cvs is this:
service cvspserver
{
         socket_type     = stream
         protocol        = tcp
         wait            = no
         user            = root
         server          = /usr/bin/cvs
         server_args     = -f --allow-root=/usr/local/cvsroot
--allow-root=/usr/local/vendoroot pserver
}

Thanks for any help.

--
Julian.