From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.6) Gecko/20050328 Fedora/1.7.6-1.2.5

Description of problem:
On 2 different Dell Optiplex GX240's.  Everything appears fine.  However on log out from GNOME.  The screen blanks and the system hangs.  (Unable to log in on virtual consoles or over the network, existing connections appear to die).

Increasing system logging to the debug level /var/log/messages, contains: 
Apr 11 14:13:22 vgcomp5 gconfd (james-3206): Resolved address "xml::/etc/gconf/g
conf.xml.defaults" to a partially writable config source at position 0
Apr 11 14:13:42 vgcomp5 fam[3218]: connect: Connection refused
Apr 11 14:18:48 vgcomp5 su(pam_unix)[4406]: session closed for user root
Apr 11 14:18:48 vgcomp5 fam[9477]: gnome-vfs user invalid request number 8
Apr 11 14:18:48 vgcomp5 fam[9477]: gnome-vfs user invalid request number 5
Apr 11 14:18:48 vgcomp5 fam[9477]: gnome-vfs user invalid request number 6
Apr 11 14:18:49 vgcomp5 fam[9477]: gnome-vfs user invalid request number 7
Apr 11 14:18:49 vgcomp5 fam[9477]: gnome-vfs user invalid request number 4
Apr 11 14:18:49 vgcomp5 gconfd (james-3206): Exiting
Apr 11 14:18:50 vgcomp5 bonobo-activation-server (james-3211): iid OAFIID:Broken
NoType:20000808 has a NULL type
Apr 11 14:18:50 vgcomp5 bonobo-activation-server (james-3211): invalid character
 '#' in iid 'OAFIID:This#!!%$iid%^$%_|~!OAFIID_ContainsBadChars'
Apr 11 14:18:51 vgcomp5 gdm(pam_unix)[3076]: session closed for user james
Apr 11 14:18:52 vgcomp5 fam[9477]: gnome-vfs user invalid request number 1
Apr 11 14:18:52 vgcomp5 fam[9477]: gnome-vfs user invalid request number 2
Apr 11 14:20:28 vgcomp5 syslogd 1.4.1: restart.
Apr 11 14:20:28 vgcomp5 syslog: syslogd startup succeeded
Apr 11 14:20:28 vgcomp5 kernel: klogd 1.4.1, log source = /proc/kmsg started.
Apr 11 14:20:28 vgcomp5 kernel: Linux version 2.6.10-1.771_FC2 (bhcompile@porky.

Since the errors are occuring with fam/gnome-vfs before and after the other errors, I've filed in under gnome-vfs.  It may belong under fam or bonobo.

Version-Release number of selected component (if applicable):
2.6.10-1.771_FC2, fam-2.6.10-9.FC2, gnome-vfs-1.0.5-18

How reproducible:
Always

Steps to Reproduce:
1. Log into gnome on Dell Optiplex GX240 (tried it on 2 different systems.  Both systems used the same stock OS HD).
2 Log out
  

Actual Results:  See description

Expected Results:  X should restart and drop you back into GDM

Additional info:

gnome-vfs-devel-1.0.5-18
gnome-vfs2-smb-2.6.0-8
gnome-vfs2-devel-2.6.0-8
gnome-vfs2-2.6.0-8
gnome-vfs-extras-0.2.0-8.1
gnome-vfs-1.0.5-18
fam-2.6.10-9.FC2
fam-devel-2.6.10-9.FC2
gnome-vfs-devel-1.0.5-18
gnome-vfs2-smb-2.6.0-8
gnome-vfs2-devel-2.6.0-8
gnome-vfs2-2.6.0-8
gnome-vfs-extras-0.2.0-8.1
gnome-vfs-1.0.5-18