Alt-F2 crashes gnome-panel

Thanks for your bug. What version of Ubuntu do you use? Could you install gnome-panel-dbg and get a backtrace of the crash (the bug-buddy dialog to send the bug upstream has it)?

I'm using Dapper.

Here's the backtrace:

Backtrace was generated from '/usr/bin/gnome-panel'

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1224169792 (LWP 7845)]
[New Thread -1268593744 (LWP 7930)]
0xffffe410 in __kernel_vsyscall ()
#0 0xffffe410 in __kernel_vsyscall ()
#1 0xb76d848b in __waitpid_nocancel ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2 0xb7f2f8e6 in libgnomeui_module_info_get ()
   from /usr/lib/libgnomeui-2.so.0
#3 <signal handler called>
#4 0xb7bb6cfd in gtk_tree_model_filter_convert_iter_to_child_iter ()
   from /usr/lib/libgtk-x11-2.0.so.0
#5 0xb7bb313c in gtk_tree_model_iter_has_child ()
   from /usr/lib/libgtk-x11-2.0.so.0
#6 0xb6f3aad4 in gail_tree_view_new ()
   from /usr/lib/gtk-2.0/modules/libgail.so
#7 0xb6f3b090 in gail_tree_view_ref_focus_cell ()
   from /usr/lib/gtk-2.0/modules/libgail.so
#8 0xb6f3b3ac in gail_tree_view_ref_focus_cell ()
   from /usr/lib/gtk-2.0/modules/libgail.so
#9 0xb785f423 in g_cclosure_marshal_VOID__VOID ()
   from /usr/lib/libgobject-2.0.so.0
#10 0xb785379f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#11 0xb78622ea in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#12 0xb7863b19 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#13 0xb7863e89 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#14 0xb7bd6c19 in gtk_tree_view_remove_column ()
   from /usr/lib/libgtk-x11-2.0.so.0
#15 0xb7bd8e7c in gtk_tree_view_set_model () from /usr/lib/libgtk-x11-2.0.so.0
#16 0xb785f423 in g_cclosure_marshal_VOID__VOID ()
   from /usr/lib/libgobject-2.0.so.0
#17 0xb785316f in g_cclosure_new_swap () from /usr/lib/libgobject-2.0.so.0
#18 0xb785379f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#19 0xb7862b17 in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#20 0xb7863b19 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#21 0xb7863e89 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#22 0xb7b24522 in gtk_object_destroy () from /usr/lib/libgtk-x11-2.0.so.0
#23 0xb7befc4f in gtk_widget_hide_on_delete ()
   from /usr/lib/libgtk-x11-2.0.so.0
#24 0xb78569f4 in g_object_run_dispose () from /usr/lib/libgobject-2.0.so.0
#25 0xb7b244de in gtk_object_destroy () from /usr/lib/libgtk-x11-2.0.so.0
#26 0xb7be86be in gtk_widget_destroy () from /usr/lib/libgtk-x11-2.0.so.0
#27 0xb7a418ab in gtk_bin_get_type () from /usr/lib/libgtk-x11-2.0.so.0
#28 0xb7b4564e in gtk_scrolled_window_get_shadow_type ()
   from /usr/lib/libgtk-x11-2.0.so.0
#29 0xb7a7d060 in gtk_container_foreach () from /usr/lib/libgtk-x11-2.0.so.0
#30 0xb7a7ed85 in gtk_container_unset_focus_chain ()
   from /usr/lib/libgtk-x11-2.0.so.0
#31 0xb7b45310 in gtk_scrolled_window_get_shadow_type ()
   from /usr/lib/libgtk-x11-2.0.so.0
#32 0xb785f423 in g_cclosure_marshal_VOID__VOID ()
   from /usr/lib/libgobject-2.0.so.0
#33 0xb785316f in g_cclosure_new_swap () from /usr/lib/libgobject-2.0.so.0
#34 0xb785379f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#35 0xb7862b17 in g_signal_stop_emission () from /usr/lib/libgobjec...

according to the backtrace that's likely to be the same issue than bug #37037 and due to the intereaction with gail, marking as duplicate, feel free to reopen if you disagree

Are you sure? (I'm not getting crashes with the panel calendar)

the other bug title is not really revelent, the backtrace looks the same though. Read http://bugzilla.gnome.org/show_bug.cgi?id=326362 upstream about it maybe