nautilus crashed with SIGSEGV in g_type_check_instance_cast()

[[e-mail]]

crash happens when i plug in my USB3 external drive into usb3 port but not always? this is a new Acer 5755-9674 work out of the box with Ubuntu 12.04. I have had 2 issues USB3 flaky at times and dim brightness keys back words. media key dont work except for volume. no big deal as they have a Cr#& lay out anyways. all other componets work fine. thanks it looks like a good release far better then 11.04. I am impressed with the quality and speed of fixes of this beta. I have not tested DVD drive or WIDI interface. Wish we could fix the The Windows bug on new computers.
Thanks

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: nautilus 1:3.3.91-0ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11
Uname: Linux 3.2.0-19-generic x86_64
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Sun Mar 18 14:44:03 2012
ExecutablePath: /usr/bin/nautilus
GsettingsChanges:
 org.gnome.nautilus.window-state geometry '844x593+52+24'
 org.gnome.nautilus.window-state maximized true
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcCmdline: nautilus -n
SegvAnalysis:
 Segfault happened at: 0x7f44b19c2ebc <g_type_check_instance_cast+60>: movzbl 0x16(%r8),%eax
 PC (0x7f44b19c2ebc) ok
 source "0x16(%r8)" (0x330033706d2e86) not located in a known VMA region (needed readable region)!
 destination "%eax" 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: Upgraded to precise on 2012-03-14 (4 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[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 #958592, 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.