DBUS_SESSION_BUS_ADDRESS empty when booting on KDE

Binary package hint: dbus

I recently upgrade to Hardy Heron.
I have Ubuntu, not Kubuntu, but I always use KDE 3.5.9.
Since, I've got an error launching banshee. It tell the dbus environment is not properly set.
env | grep -i dbus
returns nothing.

So, no DBUS_SESSION_BUS_ADDRESS is set (but the dbus daemon is running).
In order to avoid the banshee/dbus error, I need to do:
dbus-launch banshee

OR

dbus-launch --auto-syntax
export DBUS_SESSION_BUS_ADDRESS='blablabla'
banshee

and then it works well.

OR

disconnect from KDE and start GNOME.
Indeed, doing "env | grep -i dbus" under gnome returns the correct DBUS_SESSION_BUS_ADDRESS variable.

So, the brand new Hardy Heron environment is properly set for gnome but not for kde.

Note that all packages on my system come from official repositories.

Hope this is clear enough.

Tell me if anything is necessary

I don't wanna use amarok! :-)