xemacs crashes when M-x customize is run

Binary package hint: xemacs21-gnome-nomule

Release Info:
 Description: Ubuntu 8.10
 Release: 8.10

Running xemacs like this:
 xemacs --vanilla

And then running 'M-x customize<RET><RET>' from within xemacs dumps this trace to the console:

Gdk-ERROR **: BadMatch (invalid parameter attributes)
  serial 8933 error_code 8 request_code 62 minor_code 0
Locking assertion failure. Backtrace:
#0 /usr/lib/libxcb-xlib.so.0 [0x7fdf15b979fc]
#1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x17) [0x7fdf15b97b77]
#2 /usr/lib/libX11.so.6 [0x7fdf175f38c0]
#3 /usr/lib/libX11.so.6(XChangeKeyboardControl+0x1f) [0x7fdf175c58ef]
#4 /usr/lib/libX11.so.6(XAutoRepeatOn+0x19) [0x7fdf175c51e9]
#5 /usr/lib/libgdk-1.2.so.0 [0x7fdf18310375]
#6 /lib/libc.so.6(exit+0x9d) [0x7fdf163f866d]
#7 /usr/lib/libgdk-1.2.so.0 [0x7fdf18310509]
#8 /usr/lib/libX11.so.6(_XError+0xf4) [0x7fdf175ec784]
#9 /usr/lib/libX11.so.6 [0x7fdf175f420f]
#10 /usr/lib/libX11.so.6(_XEventsQueued+0x36) [0x7fdf175f4ad6]
#11 /usr/lib/libX11.so.6(XCheckIfEvent+0xf6) [0x7fdf175c5b26]
#12 xemacs [0x48d475]
#13 xemacs(check_quit+0x37) [0x54fbe7]
#14 xemacs(internal_equal+0xa5) [0x4e66e5]
#15 xemacs [0x4fa97b]
#16 xemacs [0x47c7f7]
#17 xemacs(internal_catch+0xb9) [0x47b5c9]
#18 xemacs(call_with_suspended_errors+0x21a) [0x4816ea]
#19 xemacs [0x552499]