compiz crashed with SIGSEGV in nux::Memcpy()

[Woodbj]

After installing latest updates Unity didn't launch on restart.
Unity works again after restarting.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: libnux-0.9-0 0.9.34-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-7.35-generic-pae 2.6.38
Uname: Linux 2.6.38-7-generic-pae i686
Architecture: i386
CrashCounter: 1
Date: Fri Mar 18 19:40:39 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_AU:en
 LANG=en_US.UTF-8
 LC_MESSAGES=en_AU.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0xb70a5970: movdqu (%eax),%xmm0
 PC (0xb70a5970) ok
 source "(%eax)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%xmm0" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: nux
StacktraceTop:
 ?? () from /lib/i386-linux-gnu/libc.so.6
 nux::Memcpy(void*, void const*, unsigned int) () from /usr/lib/libnux-core-0.9.so.0
 nux::CairoGraphics::GetBitmap() () from /usr/lib/libnux-image-0.9.so.0
 PanelMenuView::Refresh() () from /usr/lib/compiz/libunityshell.so
 PanelMenuView::OnActiveWindowChanged(_BamfView*, _BamfView*) () from /usr/lib/compiz/libunityshell.so
Title: compiz crashed with SIGSEGV in nux::Memcpy()
UpgradeStatus: Upgraded to natty on 2011-03-02 (15 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors: (nautilus:1664): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed