Xserver crashes when I use xsetwacom !

I installed Natty from scratch with the Beta 2, and it's of course up to date since.
I have a Wacom Intuos3, and when I set anything with the xsetwacom program, it's ok, until I make any use of what has been configured.

E.g, if I set :
xsetwacom set "Wacom Intuos3 9x12 pad" StripLeftUp "key f"
And make any use of the strip, the XServer crashes immediately.

If I set :
xsetwacom set "Wacom Intuos3 9x12 pad" Button 1 "key y"
And make any use of the Button number one, it just crashes, and so on I think you got it.

If I don't try to change the shortcuts with xsetwacom, the defaults just respond as expected.
So when it crashes, the screen just goes out for a second, and I'm on GDM the second after, waiting for me to login.

Wacom Intuos3 9x12, Ubuntu Natty 64, i7 950 | 8 GB | GTX 460 with proprietary drivers, Ubuntu classic session (so without Unity enabled, if this is of any help).

If you need any information that I don't have yet supplied, please be my guest :).
Thanks a lot !

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: xserver-xorg-core 2:1.10.1-1ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Mon May 16 14:55:57 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
ExecutablePath: /usr/bin/Xorg
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
ProcCmdline: /usr/bin/X :0 -nr -verbose -auth /var/run/gdm/auth-for-gdm-vknUpr/database -nolisten tcp vt7
ProcEnviron:
 LANG=fr_FR.UTF-8
 LANGUAGE=fr_FR:en
 PATH=(custom, no user)
SegvAnalysis:
 Segfault happened at: 0x7f0de076eca8: mov 0x24(%rbx),%eax
 PC (0x7f0de076eca8) ok
 source "0x24(%rbx)" (0x00000024) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: xorg-server
StacktraceTop:
 ?? () from /usr/lib/xorg/modules/input/wacom_drv.so
 ?? () from /usr/lib/xorg/modules/input/wacom_drv.so
 ?? () from /usr/lib/xorg/modules/input/wacom_drv.so
 ?? () from /usr/lib/xorg/modules/input/wacom_drv.so
 ?? () from /usr/lib/xorg/modules/input/wacom_drv.so
Title: Xorg crashed with SIGSEGV
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

version.compiz: compiz 1:0.9.4+bzr20110415-0ubuntu2
version.ia32-libs: ia32-libs 20090808ubuntu13
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu2
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu7.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7