All Gnome-Gtk apps crash - segmentation fault

using ubuntu dapper 6.06

All Gnome applications crash with a segmentation fault when they receive keyboard input.
They crash with "segementation fault"

gdmlogin crashes when typing any alphanumeric key (other keys do not make it crash), so I cannot even log in. I can get into my desktop by killig gdm and using the startx command. However, all gnome apps (gedit, nautilus, etc) crash when they receive keyboard input also.

Output of gdm log:

X Window System Version 7.0.0
Release Date: 21 December 2005
X Protocol Version 11, Revision 0, Release 7.0
Build Operating System:Linux 2.6.15.7 i686
Current Operating System: Linux kavokLaptop 2.6.15-27-686 #1 SMP PREEMPT Sat Sep 16 02:13:27 UTC 2006 i686
Build Date: 16 March 2006
 Before reporting problems, check http://wiki.x.org
 to make sure that you have the latest version.
Module Loader present
Markers: (--) probed, (**) from config file, (==) default setting,
 (++) from command line, (!!) notice, (II) informational,
 (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Sun Jan 28 00:38:33 2007
(==) Using config file: "/etc/X11/xorg.conf"
(WW) I810: No matching Device section for instance (BusID PCI:0:2:1) found
Synaptics DeviceInit called
SynapticsCtrl called.
Synaptics DeviceOn called
Synaptics DeviceOff called
AUDIT: Sun Jan 28 00:39:44 2007: 5467 X: client 4 rejected from local host
  Auth name: MIT-MAGIC-COOKIE-1 ID: -1
Synaptics DeviceOff called