gksu crashed with SIGSEGV in gdk_window_set_opacity()

Binary package hint: gksu

Using Ubuntu 8.04 beta, Compiz enable, NVIDIA restricted driver and updating the system make that gksu crash.

When I click for check updates in packages it ask me the password, but before I click the button to check I go to the menu and it said that a malicious software was blocking my mouse.

Then the apport app popup.

ProblemType: Crash
Architecture: i386
Date: Tue Apr 1 23:35:34 2008
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/bin/gksu
NonfreeKernelModules: nvidia
Package: gksu 2.0.0-5ubuntu1
PackageArchitecture: i386
ProcCmdline: /usr/bin/gksu --desktop /usr/share/applications/update-manager.desktop -- /usr/sbin/synaptic --hide-main-window --non-interactive --parent-window-id 54525955 --update-at-startup
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=es_NI.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: gksu
Stacktrace:
 #0 0xb7b541dc in gdk_window_set_opacity () from /usr/lib/libgdk-x11-2.0.so.0
 #1 0xb7fb0886 in ?? () from /usr/lib/libgksu2.so.0
 #2 0x616c2f65 in ?? ()
 #3 0x00000000 in ?? ()
StacktraceTop:
 gdk_window_set_opacity () from /usr/lib/libgdk-x11-2.0.so.0
 ?? () from /usr/lib/libgksu2.so.0
 ?? ()
 ?? ()
Title: gksu crashed with SIGSEGV in gdk_window_set_opacity()
Uname: Linux 2.6.24-12-generic i686
UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lpadmin plugdev sambashare scanner tape video