gtk-window-decorator crashed with SIGSEGV in g_object_unref()

Windows suddenly cannot be dragged , resulting in a partially unusable system until you run unity --replace. This crash happened after unity restarted.

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: compiz-gnome 1:0.9.9~daily13.03.08-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-11.20-generic 3.8.2
Uname: Linux 3.8.0-11-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 313.26 Wed Feb 27 13:04:31 PST 2013
 GCC version: gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-22ubuntu2)
.tmp.unity.support.test.0:

ApportVersion: 2.9.1-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Fri Mar 15 15:45:51 2013
DistUpgraded: Fresh install
DistroCodename: raring
DistroVariant: ubuntu
DkmsStatus:
 nvidia-313-updates, 313.26, 3.8.0-11-generic, x86_64: installed
 nvidia-313-updates, 313.26, 3.8.0-9-generic, x86_64: installed
ExecutablePath: /usr/bin/gtk-window-decorator
GraphicsCard:
 NVIDIA Corporation GT218 [GeForce 210] [10de:0a65] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: Giga-byte Technology Device [1458:3525]
InstallationDate: Installed on 2013-03-03 (11 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130221.1)
MachineType: Gateway SX2800
MarkForUpload: True
ProcCmdline: /usr/bin/gtk-window-decorator
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-11-generic root=UUID=fc9562cc-ca28-45d3-90a8-dab22fc4e12e ro quiet splash
SegvAnalysis:
 Segfault happened at: 0x7f137bff5415: mov (%rax),%rdi
 PC (0x7f137bff5415) ok
 source "(%rax)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%rdi" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 ?? () from /usr/lib/libwnck-1.so.22
 ?? () from /usr/lib/libwnck-1.so.22
 g_object_unref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? ()
 g_object_unref () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: gtk-window-decorator crashed with SIGSEGV in g_object_unref()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 09/11/2009
dmi.bios.vendor: AMI
dmi.bios.version: P01-A4R
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: WG43M
dmi.board.vendor: Gateway
dmi.chassis.type: 3
dmi.chassis.vendor: Gateway
dmi.modalias: dmi:bvnAMI:bvrP01-A4R:bd09/11/2009:svnGateway:pnSX2800:pvr:rvnGateway:rnWG43M:rvr:cvnGateway:ct3:cvr:
dmi.product.name: SX2800
dmi.sys.vendor: Gateway
version.compiz: compiz 1:0.9.9~daily13.03.08-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.42-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.2-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.2-0ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.13.2-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.3-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.6-0ubuntu3
xserver.bootTime: Tue Mar 12 15:45:04 2013
xserver.configfile: default
xserver.errors:
 open /dev/dri/card0: No such file or directory
 open /dev/dri/card0: No such file or directory
 open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.13.2-0ubuntu3