Unable to determine the address of the message bus

[Rod Butcher]

I have what is basically a Mandrake 10.2 box, and have installed 
Mandrake's dbus packages. I have 2 dbus daemons running, one using the 
/etc/dbus-1/session.conf file, the other using the 
etc/dbus-1/system.conf file. I understand this ought to provide a user 
message bus and a systemwide message bus, correct ?
Any app I run (e.g. gnome-screensaver, evolution) that needs to use DBUS 
output messages like the following :-
(gnome-screensaver:5434): gnome-screensaver-WARNING **: couldn't connect 
to session bus: Unable to determine the address of the message bus
(gnome-screensaver:5434): gnome-screensaver-WARNING **: failed to 
register with the message bus
I have read and digested as far as I am able (I'm not a developer) the 
documentation on the freedesktop site. What am I doing wrong ? Pointers 
to relevant documentation gratefully received.
thanks
Rod
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