Trying to launch gnome-lirc-properties:
[...]
  File "/usr/lib/python2.5/site-packages/dbus/bus.py", line 281, in
start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/python2.5/site-packages/dbus/connection.py", line 607, in
call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited:
Launch helper exited with unknown return code 1

Using PolicyKit-0.8-3.fc10.i386 and selinux-policy-targeted-3.3.1-55.fc9.noarch

Summary:

SELinux is preventing polkitd (polkit_t) "setgid" to <Unknown> (polkit_t).

Detailed Description:

SELinux denied access requested by polkitd. It is not expected that this access
is required by polkitd and this access may signal an intrusion attempt. It is
also possible that the specific version or configuration of the application is
causing it to require additional access.

Allowing Access:

You can generate a local policy module to allow this access - see FAQ
(http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Or you can disable
SELinux protection altogether. Disabling SELinux protection is not recommended.
Please file a bug report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi)
against this package.

Additional Information:

Source Context                system_u:system_r:polkit_t:s0-s0:c0.c1023
Target Context                system_u:system_r:polkit_t:s0-s0:c0.c1023
Target Objects                None [ capability ]
Source                        polkitd
Source Path                   /usr/libexec/polkitd
Port                          <Unknown>
Host                          snoogens.fab.redhat.com
Source RPM Packages           PolicyKit-0.8-3.fc10
Target RPM Packages           
Policy RPM                    selinux-policy-3.3.1-55.fc9
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   catchall
Host Name                     snoogens.fab.redhat.com
Platform                      Linux snoogens.fab.redhat.com 2.6.25-14.fc9.i686
                              #1 SMP Thu May 1 06:28:41 EDT 2008 i686 i686
Alert Count                   14
First Seen                    Fri Jul  4 17:38:38 2008
Last Seen                     Mon Jul  7 17:48:18 2008
Local ID                      2d54b420-bfcc-49ef-a302-5855e2cf3f6a
Line Numbers                  

Raw Audit Messages            

host=snoogens.fab.redhat.com type=AVC msg=audit(1215442098.49:33): avc:  denied
 { setgid } for  pid=13361 comm="polkitd" capability=6
scontext=system_u:system_r:polkit_t:s0-s0:c0.c1023
tcontext=system_u:system_r:polkit_t:s0-s0:c0.c1023 tclass=capability

host=snoogens.fab.redhat.com type=SYSCALL msg=audit(1215442098.49:33):
arch=40000003 syscall=206 success=no exit=-1 a0=1 a1=84805f0 a2=35bff4 a3=1
items=0 ppid=13360 pid=13361 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0
egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="polkitd"
exe="/usr/libexec/polkitd" subj=system_u:system_r:polkit_t:s0-s0:c0.c1023 key=(null)