Gnome desktop icons dissappear

the gnome desktop icons, terminal,trash,computer etc. dissappear from the desktop ?
how do i get them back without exiting the session and logging back in ?

it appears the problem is occuring after the session had been idle for a period of time > 3 hours... the icons disappear but the terminal sessions are still available... this is the error information:
]0;oracle@aether:~[oracle@aether ~]$ (/usr/bin/gnome-session&)
]0;oracle@aether:~[oracle@aether ~]$ SESSION_MANAGER=local/aether:/tmp/.ICE-unix/13610
Window manager warning: Log level 32: could not find XKB extension.
Initializing nautilus-open-terminal extension
** (nm-applet:13705): WARNING **: <WARN> applet_dbus_manager_start_service(): Could not acquire the NetworkManagerUserSettings service.
Message: 'Connection ":1.54" is not allowed to own the service "org.freedesktop.NetworkManagerUserSettings" due to security policies in the configuration file'
Introspect error: A security policy in place prevents this sender from sending this message to this recipient, see message bus configuration file (rejected message had interface "org.freedesktop.DBus.Introspectable" member "Introspect" error name "(unset)" destination "edu.duke.linux.yum")
Traceback (most recent call last):
File "/usr/bin/puplet", line 467, in ?
main()
File "/usr/bin/puplet", line 464, in main
p.run()
File "/usr/bin/puplet", line 451, in run
self._refreshInfo()
File "/usr/bin/puplet", line 191, in _refreshInfo
if self.updatesObject is not None and \
AttributeError: DBusException instance has no attribute '_dbus_error_name'
Unable to open desktop file /usr/share/applications/redhat-email.desktop for panel launcher: No such file or directory
Unable to open desktop file /usr/share/applications/openoffice.org-1.9-writer.desktop for panel launcher: No such file or directory
Unable to open desktop file /usr/share/applications/openoffice.org-1.9-impress.desktop for panel launcher: No such file or directory
Unable to open desktop file /usr/share/applications/openoffice.org-1.9-calc.desktop for panel launcher: No such file or directory
is there any command to refresh the desktop ?

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