every time I close the bitcoin it raises:

UNKNOWN EXCEPTION
bitcoin in CMyApp::OnUnhandledException()

with segfault

I have a NVIDIA GeForce4Ti4200, driver nouveau

$ uname -a
Linux linuxhost 3.0-ARCH #1 SMP PREEMPT Sat Aug 6 16:49:00 CEST 2011 i686 AMD Athlon(TM) XP AuthenticAMD GNU/Linux

]$ X -version

This is a pre-release version of the X server from The X.Org Foundation.
It is not supported in any way.
Bugs may be filed in the bugzilla at http://bugs.freedesktop.org/.
Select the "xorg" product for bugs you find in this release.
Before reporting bugs in pre-release versions please check the
latest version in the X.Org Foundation git repository.
See http://wiki.x.org/wiki/GitPage for git access instructions.

X.Org X Server 1.10.3.901 (1.10.4 RC 1)
Release Date: 2011-07-29
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.0.0-ARCH i686
Current Operating System: Linux linuxhost 3.0-ARCH #1 SMP PREEMPT Sat Aug 6 16:49:00 CEST 2011 i686
Kernel command line: BOOT_IMAGE=arch-fallback ro root=801
Build Date: 08 August 2011 08:28:07AM

Current version of pixman: 0.22.2
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.