nautilus crashed with SIGSEGV in g_type_check_instance_cast()

[J Cord]

Had just install the distribution updates for 9/20/12 and rebooted into the 12.10 unity desktop. Desktop sessions have been slow to respond lately so I did not think much of the slow execution of my web browser after selecting it. I had clicked on the dash panel applet first and then clicked on my browser's icon. My browser eventually opened and when loading my home page the apport crash notification appeared. I have not rebooted to see if this is reproducible , yet. I will try that after I finish what I started to do. And append this if the crash happens again.
Best Wishes

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: nautilus 1:3.5.90.really.3.4.2-0ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-15.22-generic 3.5.4
Uname: Linux 3.5.0-15-generic x86_64
ApportVersion: 2.5.2-0ubuntu4
Architecture: amd64
Date: Thu Sep 20 15:14:07 2012
ExecutablePath: /usr/bin/nautilus
GsettingsChanges: b'org.gnome.nautilus.window-state' b'geometry' b"'800x550+549+130'"
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120905.2)
ProcCmdline: nautilus -n
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f4afe3ebe8c <g_type_check_instance_cast+28>: mov (%rax),%rbp
 PC (0x7f4afe3ebe8c) ok
 source "(%rax)" (0x700000008) not located in a known VMA region (needed readable region)!
 destination "%rbp" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: nautilus
StacktraceTop:
 g_type_check_instance_cast () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libdbusmenu-gtk3.so.4
 g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: nautilus crashed with SIGSEGV in g_type_check_instance_cast()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
XsessionErrors: (nautilus:2091): GLib-GObject-WARNING **: invalid uninstantiatable type `(null)' in cast to `DbusmenuMenuitem'

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1053670, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.