gksu crashed with SIGSEGV in gdk_window_set_opacity()

[gagarine]

Binary package hint: gksu

I don't very understand what is the problem... but perhaps the automatic trace can help...

ProblemType: Crash
Architecture: amd64
Date: Tue Sep 25 15:15:18 2007
DistroRelease: Ubuntu 7.10
ExecutablePath: /usr/bin/gksu
NonfreeKernelModules: fglrx
Package: gksu 2.0.0-4ubuntu2
PackageArchitecture: amd64
ProcCmdline: gksu displayconfig-gtk
ProcCwd: /home/gagarine
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=fr_CH.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: gksu
StacktraceTop:
 gdk_window_set_opacity ()
 ?? () from /usr/lib/libgksu2.so.0
 g_main_context_dispatch ()
 ?? () from /usr/lib/libglib-2.0.so.0
 g_main_loop_run () from /usr/lib/libglib-2.0.so.0
Title: gksu crashed with SIGSEGV in gdk_window_set_opacity()
Uname: Linux area42 2.6.22-12-generic #1 SMP Sun Sep 23 20:03:18 GMT 2007 x86_64 GNU/Linux
UserGroups: adm admin audio cdrom dialout dip floppy lpadmin netdev plugdev powerdev scanner video

[Apport retracing service (apport)]

StacktraceTop:IA__gdk_window_set_opacity (window=0x6a4a30, opacity=0.5) at /build/buildd/gtk+2.0-2.12.0/gdk/x11/gdkwindow-x11.c:6447
fadeout_callback (fadeout=0x694690) at libgksu.c:321
IA__g_main_context_dispatch (context=0x63c480) at /build/buildd/glib2.0-2.14.1/glib/gmain.c:2061
g_main_context_iterate (context=0x63c480, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.14.1/glib/gmain.c:2694
IA__g_main_loop_run (loop=0x99bf00) at /build/buildd/glib2.0-2.14.1/glib/gmain.c:2898

[Hippu (teemu-heinamaki)]

I also get this bug when i try to mount my partition with nautilus. Then an error dialog pops up and says "cannot grab your mouse" or something like that. I don't know exactly because i don't run Ubuntu in English.

Is this bug a duplicate of some other bug? On top it says it is, but i can't find it. Is that bug marked as private or something like that?