unity-panel-service crashed with SIGSEGV in g_type_check_instance_is_a()

[AJenbo]

Binary package hint: indicator-datetime

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ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: indicator-datetime 0.2.3-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Sat Apr 16 11:25:53 2011
ExecutablePath: /usr/lib/unity/unity-panel-service
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110415)
ProcCmdline: /usr/lib/unity/unity-panel-service
ProcEnviron:
 SHELL=/bin/bash
 LANGUAGE=da_DK:en
 LANG=da_DK.UTF-8
SegvAnalysis:
 Segfault happened at: 0xe27998 <g_type_check_instance_is_a+120>: testb $0x4,0xe(%edx)
 PC (0x00e27998) ok
 source "$0x4" ok
 destination "0xe(%edx)" (0x0000657a) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: indicator-datetime
StacktraceTop:
 g_type_check_instance_is_a () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 gtk_calendar_select_month () from /usr/lib/libgtk-x11-2.0.so.0
 ido_calendar_menu_item_set_date () from /usr/lib/libido-0.1.so.0
 ?? () from /usr/lib/indicators/5/libdatetime.so
 g_cclosure_marshal_VOID__PARAM () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
Title: unity-panel-service crashed with SIGSEGV in g_type_check_instance_is_a()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 g_type_check_instance_is_a (type_instance=0x952d058, iface_type=156410808) at /build/buildd/glib2.0-2.28.5/./gobject/gtype.c:3961
 IA__gtk_calendar_select_month (calendar=0x952d058, month=3, year=2011) at /build/buildd/gtk+2.0-2.24.4/gtk/gtkcalendar.c:3782
 ido_calendar_menu_item_set_date (menuitem=0x94eb908, year=2011, month=3, day=16) at idocalendarmenuitem.c:383
 menu_visible_notfy_cb (menu=0x93d4010, pspec=0x93698f0, user_data=0x93be000) at indicator-datetime.c:290
 g_cclosure_marshal_VOID__PARAM (closure=0x93bea68, return_value=0x0, n_param_values=2, param_values=0x93c9d40, invocation_hint=0xbffefb60, marshal_data=0x0) at /build/buildd/glib2.0-2.28.5/./gobject/gmarshal.c:533