gdm 2.18.4 on X.org 7.3 using an ATI Radeon Mobility R250 video card - Does not look right.

When I first installed Debian, gdm worked like it should, but after doing a dist-upgrade, it comes up looking garbled. I can fix this problem temporarily by going to a console and restarting gdm. I'm pretty sure it's a configuration issue but I don't know enough about X11 to be able to tell, Where do I go from here?

Thank you for your consideration.

-- 
Levi Campbell 

# xorg.conf (xorg X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg
Section "Files" EndSection Section "InputDevice" Identifier "Generic Keyboard" Driver "kbd" Option "CoreKeyboard" Option "XkbRules" "xorg" Option "XkbModel" "pc104" Option "XkbLayout" "us" EndSection Section "InputDevice" Identifier "Configured Mouse" Driver "mouse" Option "CorePointer" Option "Device" "/dev/psaux" Option "Protocol" "PS/2" EndSection Section "InputDevice" Identifier "Synaptics Touchpad" Driver "synaptics" Option "SendCoreEvents" "true" Option "Device" "/dev/psaux" Option "Protocol" "auto-dev" Option "HorizScrollDelta" "0" EndSection Section "Device" Identifier "ATI Technologies Inc Radeon R250 [Mobility FireGL 9000]" Driver "ati" BusID "PCI:1:0:0" EndSection Section "Monitor" Identifier "Generic Monitor" Option "DPMS" HorizSync 30-70 VertRefresh 50-160 EndSection Section "Screen" Identifier "Default Screen" Device "ATI Technologies Inc Radeon R250 [Mobility FireGL 9000]" Monitor "Generic Monitor" DefaultDepth 24 SubSection "Display" Modes "1680x1050" "800x600" EndSubSection EndSection Section "ServerLayout" Identifier "Default Layout" Screen "Default Screen" InputDevice "Generic Keyboard" InputDevice "Configured Mouse" InputDevice "Synaptics Touchpad" EndSection

# GDM Custom Configuration file.
#
# This file is the appropriate place for specifying your customizations to the
# GDM configuration. If you run gdmsetup, it will automatically edit this
# file for you and will cause the daemon and any running GDM GUI programs to
# automatically update with the new configuration. Not all configuration
# options are supported by gdmsetup, so to modify some values it may be
# necessary to modify this file directly by hand.
#
# This file overrides the default configuration settings. These settings
# are stored in the GDM System Defaults configuration file, which is found
# at the following location.
#
# /usr/share/gdm/defaults.conf.
#
# This file contains comments about the meaning of each configuration option,
# so is also a useful reference. Also refer to the documentation links at
# the end of this comment for further information. In short, to hand-edit
# this file, simply add or modify the key=value combination in the
# appropriate section in the template below this comment section.
#
# For example, if you want to specify a different value for the Enable key
# in the "[debug]" section of your GDM System Defaults configuration file,
# then add "Enable=true" in the "[debug]" section of this file. If the
# key already exists in this file, then simply modify it.
#
# Older versions of GDM used the "gdm.conf" file for configuration. If your
# system has an old gdm.conf file on the system, it will be used instead of
# this file - so changes made to this file will not take effect. Consider
# migrating your configuration to this file and removing the gdm.conf file.
#
# If you hand edit a GDM configuration file, you can run the following
# command and the GDM daemon will immediately reflect the change. Any
# running GDM GUI programs will also be notified to update with the new
# configuration.
#
# gdmflexiserver --command="UPDATE_CONFIG <configuration key>"
#
# e.g, the "Enable" key in the "[debug]" section would be "debug/Enable".
#
# You can also run gdm-restart or gdm-safe-restart to cause GDM to restart and
# re-read the new configuration settings. You can also restart GDM by sending
# a HUP or USR1 signal to the daemon. HUP behaves like gdm-restart and causes
# any user session started by GDM to exit immediately while USR1 behaves like
# gdm-safe-restart and will wait until all users log out before restarting GDM.
#
# For full reference documentation see the gnome help browser under
# GNOME|System category. You can also find the docs in HTML form on
# http://www.gnome.org/projects/gdm/
#
# NOTE: Lines that begin with "#" are considered comments.
#
# Have fun!
[daemon] [security] [xdmcp] [gui] [greeter] [chooser] [debug]
# Note that to disable servers defined in the GDM System Defaults
# configuration file (such as 0=Standard, you must put a line in this file
# that says 0=inactive, as described in the Configuration section of the GDM
# documentation.
#
[servers]
# Also note, that if you redefine a [server-foo] section, then GDM will
# use the definition in this file, not the GDM System Defaults configuration
# file. It is currently not possible to disable a [server-foo] section
# defined in the GDM System Defaults configuration file.
#
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