I'm also getting this error on Lucid

xsession-errors, below.

/etc/gdm/Xsession: Beginning session setup...
Setting IM through im-switch for locale=en_US.
Start IM through /etc/X11/xinit/xinput.d/all_ALL linked to /etc/X11/xinit/xinput.d/default.
GNOME_KEYRING_CONTROL=/tmp/keyring-l4fo4i
GNOME_KEYRING_CONTROL=/tmp/keyring-l4fo4i
GNOME_KEYRING_CONTROL=/tmp/keyring-l4fo4i
SSH_AUTH_SOCK=/tmp/keyring-l4fo4i/ssh
gnome-session[1579]: WARNING: Could not launch application '10331acf3baa216e2129288350344912200000011790030.desktop': Unable to start application: Failed to execute child process "evolution-exchange-storage" (No such file or directory)

(polkit-gnome-authentication-agent-1:1663): GLib-GObject-WARNING **: cannot register existing type `_PolkitError'

(polkit-gnome-authentication-agent-1:1663): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed

(gnome-power-manager:1648): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.24.1/gobject/gsignal.c:2273: signal `proxy-status' is invalid for instance `0x82ca010'
Unable to find a synaptics device.
Initializing nautilus-gdu extension

** (mail-notification:1659): WARNING **: Invalid borders specified for theme pixmap:
        /home/terrymon/.themes/Mac4Lin_GTK_Aqua_v1.0/gtk-2.0/Shadows/shadow-out.png,
borders don't fit within the image
Using /home/terrymon/.wbar config file.
Conky: desktop window (260005e) is subwindow of root window (63)
Conky: window type - override
Conky: drawing to created window (0x4400001)
Conky: drawing to double buffer
Using a Super Bar.
evolution-alarm-notify-Message: Setting timeout for 22403 1293253200 1293230797
evolution-alarm-notify-Message: Setting timeout for 22403 1293253200 1293230797
evolution-alarm-notify-Message:  Sat Dec 25 00:00:00 2010

evolution-alarm-notify-Message:  Fri Dec 24 17:46:37 2010

evolution-alarm-notify-Message:  Sat Dec 25 00:00:00 2010

evolution-alarm-notify-Message:  Fri Dec 24 17:46:37 2010


(evolution-alarm-notify:1776): evolution-alarm-notify-WARNING **: Could not create the alarm notify service factory, maybe it's already running...
** (update-notifier:1823): DEBUG: Skipping reboot required
[1837:1850:306873743:ERROR:net/disk_cache/backend_impl.cc(1166)] Critical error found -8
Nautilus-Share-Message: Called "net usershare info" but it failed: 'net usershare' returned error 255: net usershare: cannot open usershare directory /var/lib/samba/usershares. Error No such file or directory
Please ask your system administrator to enable user sharing.


(exe:1988): Gdk-WARNING **: XID collision, trouble ahead

** (gedit:1935): WARNING **: Invalid borders specified for theme pixmap:
        /home/terrymon/.themes/Mac4Lin_GTK_Aqua_v1.0/gtk-2.0/Shadows/shadow-out.png,
borders don't fit within the image

(yelp:2004): Gtk-CRITICAL **: gtk_tool_button_new: assertion `icon_widget == NULL || GTK_IS_MISC (icon_widget)' failed

(yelp:2004): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(yelp:2004): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(yelp:2004): Gtk-CRITICAL **: gtk_toolbar_insert: assertion `GTK_IS_TOOL_ITEM (item)' failed

(yelp:2004): Gtk-CRITICAL **: gtk_tool_button_new: assertion `icon_widget == NULL || GTK_IS_MISC (icon_widget)' failed

(yelp:2004): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(yelp:2004): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(yelp:2004): Gtk-CRITICAL **: gtk_toolbar_insert: assertion `GTK_IS_TOOL_ITEM (item)' failed
Window manager warning: Received a _NET_WM_MOVERESIZE message for 0x5a00003 (syslog.1 -); these messages lack timestamps and therefore suck.