I'm having this problem also. Running Jaunty, all up to date.
I notice that gnome-panel is being started up with arguments as follows:
gnome-panel --sm-config-prefix /gnome-panel-svkHHa/ --sm-client-id
103a4ad18dff7eaf7012452818144070730036800023 --screen 0
notice that "--screen 0" bit.
I think I might be seeing the same thing in gnome-terminal.
Jun 1 12:04:55 kernel: [364820.486296] gnome-terminal[3062]:
segfault at 40e ip b70a96c0 sp bfe70f70 error 4 in
libgobject-2.0.so.0.2600.1[b708+41000]
It happens sometimes when I close a window.
Might be the same thing affecti