gksu crashed with SIGSEGV in gdk_window_set_opacity()

[mankind03]

Binary package hint: gksu

terminal in root mode failed, but i didn't open the terminal

ProblemType: Crash
Architecture: i386
CrashCounter: 1
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/bin/gksu
NonfreeKernelModules: wl
Package: gksu 2.0.0-5ubuntu3
ProcAttrCurrent: unconfined
ProcCmdline: gksu /usr/sbin/gdmsetup
ProcEnviron:
 LANG=es_MX.UTF-8
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11:/usr/games
 SHELL=/bin/bash
Signal: 11
SourcePackage: gksu
StacktraceTop:
 gdk_window_set_opacity () from /usr/lib/libgdk-x11-2.0.so.0
 ?? () from /usr/lib/libgksu2.so.0
 ?? () from /usr/lib/libglib-2.0.so.0
 g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
 ?? () from /usr/lib/libglib-2.0.so.0
Title: gksu crashed with SIGSEGV in gdk_window_set_opacity()
Uname: Linux 2.6.24-21-generic i686
UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lpadmin plugdev sambashare scanner video