Karmic:typing compiz in a terminal locks up for a few time the system and/or compiz takes a very long time to run

Binary package hint: compiz

I'm using Ubuntu Karmic and a Nvidia 8400 video card (256 mb) with drivers enabled.
I typed compiz in a terminal and the system locks for 5 seconds, when the system unlocks, I waited one minute and then I closed the terminal because compiz doesn't run.
My compiz version is 1:0.8.4-0ubuntu2.

ProblemType: Crash
Architecture: i386
AssertionMessage: *** glibc detected *** /usr/bin/compiz.real: double free or corruption (!prev): 0x09258c38 ***
CompizPlugins: [core,move,resize,place,decoration,animation,ccp,dbus,mousepoll,gnomecompat,png,svg,imgjpeg,text,commands,neg,video,wall,snap,scale,scaleaddon,expo,staticswitcher,regex,resizeinfo,workarounds,ezoom,vpswitch,extrawm,fade,session,shift,wobbly]
Date: Sun Nov 1 09:38:03 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/compiz.real
Lsusb:
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
NonfreeKernelModules: nvidia
Package: compiz-core 1:0.8.4-0ubuntu2
PciDisplay: 02:00.0 VGA compatible controller [0300]: nVidia Corporation G98 [GeForce 8400 GS] [10de:06e4] (rev a1)
ProcCmdLine: root=UUID=ceae49a8-7361-4c11-a13d-05422bdb6a20 ro quiet splash
ProcCmdline: /usr/bin/compiz.real --ignore-desktop-hints --replace --sm-client-id 10fb54029c56654808125706402779314700000017320028 --loose-binding move resize place decoration animation ccp
ProcEnviron:
 LANGUAGE=it_IT.UTF-8
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
 xserver-xorg 1:7.4+3ubuntu7
 libgl1-mesa-glx 7.6.0-1ubuntu4
 libdrm2 2.4.14-1ubuntu1
 xserver-xorg-video-intel 2:2.9.0-1ubuntu2
 xserver-xorg-video-ati 1:6.12.99+git20090929.7968e1fb-0ubuntu1
Signal: 6
SourcePackage: compiz
StacktraceTop:
 __kernel_vsyscall ()
 raise () from /lib/tls/i686/cmov/libc.so.6
 abort () from /lib/tls/i686/cmov/libc.so.6
 ?? () from /lib/tls/i686/cmov/libc.so.6
 ?? () from /lib/tls/i686/cmov/libc.so.6
Title: compiz.real assert failure: *** glibc detected *** /usr/bin/compiz.real: double free or corruption (!prev): 0x09258c38 ***
Uname: Linux 2.6.31-14-generic i686
UserGroups: adm admin audio cdrom dialout dip floppy fuse lpadmin plugdev video
dmi.bios.date: 03/06/2007
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F1
dmi.board.name: M61SME-S2
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF1:bd03/06/2007:svn:pn:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnM61SME-S2:rvrx.x:cvn:ct3:cvr:
system: distro = Ubuntu, architecture = i686, kernel = 2.6.31-14-generic