@fanthom,
I am using the iso disk of Porteus v 1.0 final now. I want to list the running sessions, so I open a console and type:
bash-4.1$ ck-list-sessions
** (ck-list-sessions:2619): WARNING **: Failed to get list of seats: Failed to execute program /usr/libexec/dbus-daemon-launch-helper: Success
bash-4.1$
I submit this result as bug, log out and come back soon with an edit:
Now I am back, but using iso disk of Porteus v1.0 rc2, and I do the same as above and get this response:
bash-4.1$ ck-list-sessions
Session1:
unix-user = '1000'
realname = '(null)'
seat = 'Seat1'
session-type = ''
active = TRUE
x11-display = ':0'
x11-display-device = '/dev/tty7'
display-device = ''
remote-host-name = ''
is-local = TRUE
on-since = '2011-09-12T22:54:43.193138Z'
login-session-id = ''
bash-4.1$
This is the right result!
I am trying to find out what happened in between; it would be nice to have this corrected in v 1.1..
Suspect is dbus-1?

Regards!
EDIT: I found it! There is a daemon to be started in rc.M to get console kit working; if you start by hand /usr/sbin/console-kit-daemon it is then ok, just try starting a new session and then asking for the list.
root@porteus:~# ck-list-sessions
root@porteus:~# ck-launch-session /bin/bash
root@porteus:~# ck-list-sessions
Session2:
unix-user = '0'
realname = '(null)'
seat = 'Seat1'
session-type = ''
active = TRUE
x11-display = ':0'
x11-display-device = '/dev/tty7'
display-device = '/dev/pts/1'
remote-host-name = ''
is-local = TRUE
on-since = '2011-09-13T10:12:55.830636Z'
login-session-id = ''
root@porteus:~#
I will try to make a rc.M patch for it and report back!

EDIT: I added a line in my /rootcopy/etc/rc.d/rc.local:
[ -x /etc/rc.d/rc.consolekit ] && /etc/rc.d/rc.consolekit start
and the issue is forgotten, until v 1.1.