unity-control-center crashed with SIGSEGV in gtk_list_store_reorder()

I don't know why or what; the bug reporting started automatically and I am simply following it through in the hope that it will be of some help. Yesterday I upgraded from 14.04LTS 64 bit to 14.10 64 bit from Ubuntu Software Centre. The "bug" occurred as I was closing out of Thunderbird (mail) and Firefox (web) but prior to closing down I was attempting to add an American town to the clock menu so it may have had something to do with that.

Sorry I can't be of any more help than that.

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: unity-control-center 14.10.0+14.10.20140922-0ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-22.29-generic 3.16.4
Uname: Linux 3.16.0-22-generic x86_64
ApportVersion: 2.14.7-0ubuntu6
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Oct 27 08:07:47 2014
ExecutablePath: /usr/bin/unity-control-center
ProcCmdline: unity-control-center datetime
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
 LANGUAGE=en_AU:en
SegvAnalysis:
 Segfault happened at: 0x7f1aaa1f9554 <gtk_list_store_reorder+196>: mov %ebx,(%r14,%rax,4)
 PC (0x7f1aaa1f9554) ok
 source "%ebx" ok
 destination "(%r14,%rax,4)" (0x1d7bc2850) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: unity-control-center
StacktraceTop:
 gtk_list_store_reorder () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/unity-control-center-1/panels/libdatetime.so
 ?? () 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
 g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: unity-control-center crashed with SIGSEGV in gtk_list_store_reorder()
UpgradeStatus: Upgraded to utopic on 2014-10-26 (0 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
usr_lib_unity-control-center: deja-dup 32.0-0ubuntu1