compiz crashed with SIGSEGV in g_source_unref()

[xraid]

Binary package hint: compiz

Hi guys.
After last ubuntu 11.04 partial update my display is blank (no signal to monitor).
I must switch to tty1, then start "startx" and desktop loads. Still without unity. Then I must start gnome-terminal and start "unity". Afterwards this error was thrown.

I experiencing plenty of problems with compiz. For example no main meni in title bar after few minutes of work with computer, compiz is still crashing and is really unstable. Need to reboot PC twice a day.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: compiz-core 1:0.9.4-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
Uname: Linux 2.6.38-6-generic x86_64
Architecture: amd64
CrashCounter: 1
Date: Tue Mar 15 21:59:05 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcCmdline: compiz
ProcEnviron:
 LANG=sk_SK.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f7cf947bf45 <g_source_unref+5>: mov 0x20(%rdi),%rsi
 PC (0x7f7cf947bf45) ok
 source "0x20(%rdi)" (0x0000001f) not located in a known VMA region (needed readable region)!
 destination "%rsi" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 g_source_unref () from /lib/libglib-2.0.so.0
 PrivateScreen::~PrivateScreen() ()
 PrivateScreen::~PrivateScreen() ()
 CompScreen::~CompScreen() ()
 CompScreen::~CompScreen() ()
Title: compiz crashed with SIGSEGV in g_source_unref()
UpgradeStatus: Upgraded to natty on 2011-03-15 (0 days ago)
UserGroups: adm admin cdrom dialout lp lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 g_source_unref (source=0xffffffffffffffff) at /build/buildd/glib2.0-2.28.3/./glib/gmain.c:1734
 ~RefPtr (this=0x68cab0, __in_chrg=<value optimized out>) at /usr/include/glibmm-2.4/glibmm/refptr.h:207
 PrivateScreen::~PrivateScreen (this=0x68cab0, __in_chrg=<value optimized out>) at /build/buildd/compiz-0.9.4/src/screen.cpp:4781
 __exchange_and_add_single (this=0x68cab0, __in_chrg=<value optimized out>) at /usr/include/c++/4.5/ext/atomicity.h:65
 __exchange_and_add_dispatch (this=0x68cab0, __in_chrg=<value optimized out>) at /usr/include/c++/4.5/ext/atomicity.h:81