Activity log for bug #37363

Date Who What changed Old value New value Message
2006-03-30 17:05:07 TheIndra bug added bug
2006-03-30 17:10:15 TheIndra description Distribution: Ubuntu 5.10 (breezy) Package: gnome-panel Severity: critical Version: GNOME2.12.1 unspecified Gnome-Distributor: Ubuntu Synopsis: Every applet of Gnome-Panel crashes Bugzilla-Product: gnome-panel Bugzilla-Component: Panel Bugzilla-Version: unspecified BugBuddy-GnomeVersion: 2.0 (2.12.0) Description: Description of the crash: Every applet of Gnome-Panel crashes. It's randomly! Before i had problems with wnck-applet and I think this is the problem. I reconfigured the wnck-applet and than it works some time. How often does this happen? Sometimes it works a few hours and sometimes it crashes every 5 - 10 minutes Debugging Information: Backtrace was generated from '/usr/libexec/wnck-applet' Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1". (no debugging symbols found) ... (no debugging symbols found) [Thread debugging using libthread_db enabled] [New Thread -1223473472 (LWP 15743)] (no debugging symbols found) ... (no debugging symbols found) 0xffffe410 in ?? () #0 0xffffe410 in ?? () #1 0xbfddbe2c in ?? () #2 0x00000000 in ?? () #3 0xbfddbd88 in ?? () #4 0xb79ee4a3 in __waitpid_nocancel () from /lib/tls/i686/cmov/libpthread.so.0 #5 0xb7f33508 in libgnomeui_module_info_get () from /usr/lib/libgnomeui-2.so.0 #6 <signal handler called> #7 0xb7f9da2f in wnck_window_get_transient () from /usr/lib/libwnck-1.so.18 #8 0xb7f99cce in wnck_tasklist_get_size_hint_list () from /usr/lib/libwnck-1.so.18 #9 0xb7f9c291 in wnck_tasklist_get_size_hint_list () from /usr/lib/libwnck-1.so.18 #10 0xb7a31c2a in g_slist_foreach () from /usr/lib/libglib-2.0.so.0 #11 0xb7f97f08 in wnck_tasklist_get_type () from /usr/lib/libwnck-1.so.18 #12 0xb7a9f991 in g_type_create_instance () from /usr/lib/libgobject-2.0.so.0 #13 0xb7a86366 in g_object_thaw_notify () from /usr/lib/libgobject-2.0.so.0 #14 0xb7a869d7 in g_object_newv () from /usr/lib/libgobject-2.0.so.0 #15 0xb7a87569 in g_object_new_valist () from /usr/lib/libgobject-2.0.so.0 #16 0xb7a87712 in g_object_new () from /usr/lib/libgobject-2.0.so.0 #17 0xb7f9c660 in wnck_tasklist_new () from /usr/lib/libwnck-1.so.18 #18 0x0804e233 in window_list_applet_fill () #19 0xb7fb7971 in panel_applet_marshal_BOOLEAN__STRING () from /usr/lib/libpanel-applet-2.so.0 #20 0xb7a813a8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 #21 0xb74d9566 in bonobo_closure_invoke_va_list () from /usr/lib/libbonobo-2.so.0 #22 0xb74d9854 in bonobo_closure_invoke () from /usr/lib/libbonobo-2.so.0 #23 0xb7fb37d0 in panel_applet_get_type () from /usr/lib/libpanel-applet-2.so.0 #24 0xb7a8cab3 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0 #25 0xb7a813a8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 #26 0xb7a8fb13 in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0 #27 0xb7a91150 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0 #28 0xb7a914c3 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0 #29 0xb7e9f848 in bonobo_control_add_listener () from /usr/lib/libbonoboui-2.so.0 #30 0xb74dadeb in _ORBIT_skel_small_Bonobo_Control_setFrame () from /usr/lib/libbonobo-2.so.0 #31 0xb7473260 in ORBit_POA_setup_root () from /usr/lib/libORBit-2.so.0 #32 0xb7477c4e in ORBit_OAObject_invoke () from /usr/lib/libORBit-2.so.0 #33 0xb7464ceb in ORBit_small_invoke_adaptor () from /usr/lib/libORBit-2.so.0 #34 0xb747357c in ORBit_POAObject_post_invoke () from /usr/lib/libORBit-2.so.0 #35 0xb7473c1b in ORBit_POAObject_post_invoke () from /usr/lib/libORBit-2.so.0 #36 0xb7476641 in ORBit_c_stub_invoke () from /usr/lib/libORBit-2.so.0 #37 0xb7477ba3 in ORBit_handle_request () from /usr/lib/libORBit-2.so.0 #38 0xb7461d10 in giop_connection_handle_input () from /usr/lib/libORBit-2.so.0 #39 0xb747e24d in link_connection_set_max_buffer () from /usr/lib/libORBit-2.so.0 #40 0xb747fe23 in link_servers_move_io_T () from /usr/lib/libORBit-2.so.0 #41 0xb7a1b4ee in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 #42 0xb7a1e4f6 in g_main_context_check () from /usr/lib/libglib-2.0.so.0 #43 0xb7a1e7e3 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0 #44 0xb74c7590 in bonobo_main () from /usr/lib/libbonobo-2.so.0 #45 0xb74c5aab in bonobo_generic_factory_main_timeout () from /usr/lib/libbonobo-2.so.0 #46 0xb74c5b2f in bonobo_generic_factory_main () from /usr/lib/libbonobo-2.so.0 #47 0xb7fb5358 in panel_applet_factory_main_closure () from /usr/lib/libpanel-applet-2.so.0 #48 0xb7fb542a in panel_applet_factory_main () from /usr/lib/libpanel-applet-2.so.0 #49 0x0804cbdf in main () Thread 1 (Thread -1223473472 (LWP 15743)): #0 0xffffe410 in ?? () No symbol table info available. #1 0xbfddbe2c in ?? () No symbol table info available. #2 0x00000000 in ?? () No symbol table info available. #3 0xbfddbd88 in ?? () No symbol table info available. #4 0xb79ee4a3 in __waitpid_nocancel () from /lib/tls/i686/cmov/libpthread.so.0 No symbol table info available. #5 0xb7f33508 in libgnomeui_module_info_get () from /usr/lib/libgnomeui-2.so.0 No symbol table info available. #6 <signal handler called> No symbol table info available. #7 0xb7f9da2f in wnck_window_get_transient () from /usr/lib/libwnck-1.so.18 No symbol table info available. #8 0xb7f99cce in wnck_tasklist_get_size_hint_list () from /usr/lib/libwnck-1.so.18 No symbol table info available. #9 0xb7f9c291 in wnck_tasklist_get_size_hint_list () from /usr/lib/libwnck-1.so.18 No symbol table info available. #10 0xb7a31c2a in g_slist_foreach () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #11 0xb7f97f08 in wnck_tasklist_get_type () from /usr/lib/libwnck-1.so.18 No symbol table info available. #12 0xb7a9f991 in g_type_create_instance () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #13 0xb7a86366 in g_object_thaw_notify () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #14 0xb7a869d7 in g_object_newv () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #15 0xb7a87569 in g_object_new_valist () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #16 0xb7a87712 in g_object_new () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #17 0xb7f9c660 in wnck_tasklist_new () from /usr/lib/libwnck-1.so.18 No symbol table info available. #18 0x0804e233 in window_list_applet_fill () No symbol table info available. #19 0xb7fb7971 in panel_applet_marshal_BOOLEAN__STRING () from /usr/lib/libpanel-applet-2.so.0 No symbol table info available. #20 0xb7a813a8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #21 0xb74d9566 in bonobo_closure_invoke_va_list () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #22 0xb74d9854 in bonobo_closure_invoke () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #23 0xb7fb37d0 in panel_applet_get_type () from /usr/lib/libpanel-applet-2.so.0 No symbol table info available. #24 0xb7a8cab3 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #25 0xb7a813a8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #26 0xb7a8fb13 in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #27 0xb7a91150 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #28 0xb7a914c3 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #29 0xb7e9f848 in bonobo_control_add_listener () from /usr/lib/libbonoboui-2.so.0 No symbol table info available. #30 0xb74dadeb in _ORBIT_skel_small_Bonobo_Control_setFrame () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #31 0xb7473260 in ORBit_POA_setup_root () from /usr/lib/libORBit-2.so.0 No symbol table info available. #32 0xb7477c4e in ORBit_OAObject_invoke () from /usr/lib/libORBit-2.so.0 No symbol table info available. #33 0xb7464ceb in ORBit_small_invoke_adaptor () from /usr/lib/libORBit-2.so.0 No symbol table info available. #34 0xb747357c in ORBit_POAObject_post_invoke () from /usr/lib/libORBit-2.so.0 No symbol table info available. #35 0xb7473c1b in ORBit_POAObject_post_invoke () from /usr/lib/libORBit-2.so.0 No symbol table info available. #36 0xb7476641 in ORBit_c_stub_invoke () from /usr/lib/libORBit-2.so.0 No symbol table info available. #37 0xb7477ba3 in ORBit_handle_request () from /usr/lib/libORBit-2.so.0 No symbol table info available. #38 0xb7461d10 in giop_connection_handle_input () from /usr/lib/libORBit-2.so.0 No symbol table info available. #39 0xb747e24d in link_connection_set_max_buffer () from /usr/lib/libORBit-2.so.0 No symbol table info available. #40 0xb747fe23 in link_servers_move_io_T () from /usr/lib/libORBit-2.so.0 No symbol table info available. #41 0xb7a1b4ee in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #42 0xb7a1e4f6 in g_main_context_check () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #43 0xb7a1e7e3 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #44 0xb74c7590 in bonobo_main () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #45 0xb74c5aab in bonobo_generic_factory_main_timeout () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #46 0xb74c5b2f in bonobo_generic_factory_main () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #47 0xb7fb5358 in panel_applet_factory_main_closure () from /usr/lib/libpanel-applet-2.so.0 No symbol table info available. #48 0xb7fb542a in panel_applet_factory_main () from /usr/lib/libpanel-applet-2.so.0 No symbol table info available. #49 0x0804cbdf in main () No symbol table info available. #0 0xffffe410 in ?? () Distribution: Ubuntu 5.10 (breezy) Package: gnome-panel Version: GNOME2.12.1 unspecified Description of the crash: Every applet of Gnome-Panel crashes. It's randomly! Before i had problems with wnck-applet and I think this is the problem. I reconfigured the wnck-applet and than it works some time. How often does this happen? Sometimes it works a few hours and sometimes it crashes every 5 - 10 minutes Debugging Information: Backtrace was generated from '/usr/libexec/wnck-applet' Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1". (no debugging symbols found) ... (no debugging symbols found) [Thread debugging using libthread_db enabled] [New Thread -1223473472 (LWP 15743)] (no debugging symbols found) ... (no debugging symbols found) 0xffffe410 in ?? () #0 0xffffe410 in ?? () #1 0xbfddbe2c in ?? () #2 0x00000000 in ?? () #3 0xbfddbd88 in ?? () #4 0xb79ee4a3 in __waitpid_nocancel () from /lib/tls/i686/cmov/libpthread.so.0 #5 0xb7f33508 in libgnomeui_module_info_get () from /usr/lib/libgnomeui-2.so.0 #6 <signal handler called> #7 0xb7f9da2f in wnck_window_get_transient () from /usr/lib/libwnck-1.so.18 #8 0xb7f99cce in wnck_tasklist_get_size_hint_list () from /usr/lib/libwnck-1.so.18 #9 0xb7f9c291 in wnck_tasklist_get_size_hint_list () from /usr/lib/libwnck-1.so.18 #10 0xb7a31c2a in g_slist_foreach () from /usr/lib/libglib-2.0.so.0 #11 0xb7f97f08 in wnck_tasklist_get_type () from /usr/lib/libwnck-1.so.18 #12 0xb7a9f991 in g_type_create_instance () from /usr/lib/libgobject-2.0.so.0 #13 0xb7a86366 in g_object_thaw_notify () from /usr/lib/libgobject-2.0.so.0 #14 0xb7a869d7 in g_object_newv () from /usr/lib/libgobject-2.0.so.0 #15 0xb7a87569 in g_object_new_valist () from /usr/lib/libgobject-2.0.so.0 #16 0xb7a87712 in g_object_new () from /usr/lib/libgobject-2.0.so.0 #17 0xb7f9c660 in wnck_tasklist_new () from /usr/lib/libwnck-1.so.18 #18 0x0804e233 in window_list_applet_fill () #19 0xb7fb7971 in panel_applet_marshal_BOOLEAN__STRING () from /usr/lib/libpanel-applet-2.so.0 #20 0xb7a813a8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 #21 0xb74d9566 in bonobo_closure_invoke_va_list () from /usr/lib/libbonobo-2.so.0 #22 0xb74d9854 in bonobo_closure_invoke () from /usr/lib/libbonobo-2.so.0 #23 0xb7fb37d0 in panel_applet_get_type () from /usr/lib/libpanel-applet-2.so.0 #24 0xb7a8cab3 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0 #25 0xb7a813a8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 #26 0xb7a8fb13 in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0 #27 0xb7a91150 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0 #28 0xb7a914c3 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0 #29 0xb7e9f848 in bonobo_control_add_listener () from /usr/lib/libbonoboui-2.so.0 #30 0xb74dadeb in _ORBIT_skel_small_Bonobo_Control_setFrame () from /usr/lib/libbonobo-2.so.0 #31 0xb7473260 in ORBit_POA_setup_root () from /usr/lib/libORBit-2.so.0 #32 0xb7477c4e in ORBit_OAObject_invoke () from /usr/lib/libORBit-2.so.0 #33 0xb7464ceb in ORBit_small_invoke_adaptor () from /usr/lib/libORBit-2.so.0 #34 0xb747357c in ORBit_POAObject_post_invoke () from /usr/lib/libORBit-2.so.0 #35 0xb7473c1b in ORBit_POAObject_post_invoke () from /usr/lib/libORBit-2.so.0 #36 0xb7476641 in ORBit_c_stub_invoke () from /usr/lib/libORBit-2.so.0 #37 0xb7477ba3 in ORBit_handle_request () from /usr/lib/libORBit-2.so.0 #38 0xb7461d10 in giop_connection_handle_input () from /usr/lib/libORBit-2.so.0 #39 0xb747e24d in link_connection_set_max_buffer () from /usr/lib/libORBit-2.so.0 #40 0xb747fe23 in link_servers_move_io_T () from /usr/lib/libORBit-2.so.0 #41 0xb7a1b4ee in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 #42 0xb7a1e4f6 in g_main_context_check () from /usr/lib/libglib-2.0.so.0 #43 0xb7a1e7e3 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0 #44 0xb74c7590 in bonobo_main () from /usr/lib/libbonobo-2.so.0 #45 0xb74c5aab in bonobo_generic_factory_main_timeout () from /usr/lib/libbonobo-2.so.0 #46 0xb74c5b2f in bonobo_generic_factory_main () from /usr/lib/libbonobo-2.so.0 #47 0xb7fb5358 in panel_applet_factory_main_closure () from /usr/lib/libpanel-applet-2.so.0 #48 0xb7fb542a in panel_applet_factory_main () from /usr/lib/libpanel-applet-2.so.0 #49 0x0804cbdf in main () Thread 1 (Thread -1223473472 (LWP 15743)): #0 0xffffe410 in ?? () No symbol table info available. #1 0xbfddbe2c in ?? () No symbol table info available. #2 0x00000000 in ?? () No symbol table info available. #3 0xbfddbd88 in ?? () No symbol table info available. #4 0xb79ee4a3 in __waitpid_nocancel () from /lib/tls/i686/cmov/libpthread.so.0 No symbol table info available. #5 0xb7f33508 in libgnomeui_module_info_get () from /usr/lib/libgnomeui-2.so.0 No symbol table info available. #6 <signal handler called> No symbol table info available. #7 0xb7f9da2f in wnck_window_get_transient () from /usr/lib/libwnck-1.so.18 No symbol table info available. #8 0xb7f99cce in wnck_tasklist_get_size_hint_list () from /usr/lib/libwnck-1.so.18 No symbol table info available. #9 0xb7f9c291 in wnck_tasklist_get_size_hint_list () from /usr/lib/libwnck-1.so.18 No symbol table info available. #10 0xb7a31c2a in g_slist_foreach () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #11 0xb7f97f08 in wnck_tasklist_get_type () from /usr/lib/libwnck-1.so.18 No symbol table info available. #12 0xb7a9f991 in g_type_create_instance () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #13 0xb7a86366 in g_object_thaw_notify () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #14 0xb7a869d7 in g_object_newv () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #15 0xb7a87569 in g_object_new_valist () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #16 0xb7a87712 in g_object_new () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #17 0xb7f9c660 in wnck_tasklist_new () from /usr/lib/libwnck-1.so.18 No symbol table info available. #18 0x0804e233 in window_list_applet_fill () No symbol table info available. #19 0xb7fb7971 in panel_applet_marshal_BOOLEAN__STRING () from /usr/lib/libpanel-applet-2.so.0 No symbol table info available. #20 0xb7a813a8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #21 0xb74d9566 in bonobo_closure_invoke_va_list () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #22 0xb74d9854 in bonobo_closure_invoke () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #23 0xb7fb37d0 in panel_applet_get_type () from /usr/lib/libpanel-applet-2.so.0 No symbol table info available. #24 0xb7a8cab3 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #25 0xb7a813a8 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #26 0xb7a8fb13 in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #27 0xb7a91150 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #28 0xb7a914c3 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0 No symbol table info available. #29 0xb7e9f848 in bonobo_control_add_listener () from /usr/lib/libbonoboui-2.so.0 No symbol table info available. #30 0xb74dadeb in _ORBIT_skel_small_Bonobo_Control_setFrame () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #31 0xb7473260 in ORBit_POA_setup_root () from /usr/lib/libORBit-2.so.0 No symbol table info available. #32 0xb7477c4e in ORBit_OAObject_invoke () from /usr/lib/libORBit-2.so.0 No symbol table info available. #33 0xb7464ceb in ORBit_small_invoke_adaptor () from /usr/lib/libORBit-2.so.0 No symbol table info available. #34 0xb747357c in ORBit_POAObject_post_invoke () from /usr/lib/libORBit-2.so.0 No symbol table info available. #35 0xb7473c1b in ORBit_POAObject_post_invoke () from /usr/lib/libORBit-2.so.0 No symbol table info available. #36 0xb7476641 in ORBit_c_stub_invoke () from /usr/lib/libORBit-2.so.0 No symbol table info available. #37 0xb7477ba3 in ORBit_handle_request () from /usr/lib/libORBit-2.so.0 No symbol table info available. #38 0xb7461d10 in giop_connection_handle_input () from /usr/lib/libORBit-2.so.0 No symbol table info available. #39 0xb747e24d in link_connection_set_max_buffer () from /usr/lib/libORBit-2.so.0 No symbol table info available. #40 0xb747fe23 in link_servers_move_io_T () from /usr/lib/libORBit-2.so.0 No symbol table info available. #41 0xb7a1b4ee in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #42 0xb7a1e4f6 in g_main_context_check () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #43 0xb7a1e7e3 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0 No symbol table info available. #44 0xb74c7590 in bonobo_main () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #45 0xb74c5aab in bonobo_generic_factory_main_timeout () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #46 0xb74c5b2f in bonobo_generic_factory_main () from /usr/lib/libbonobo-2.so.0 No symbol table info available. #47 0xb7fb5358 in panel_applet_factory_main_closure () from /usr/lib/libpanel-applet-2.so.0 No symbol table info available. #48 0xb7fb542a in panel_applet_factory_main () from /usr/lib/libpanel-applet-2.so.0 No symbol table info available. #49 0x0804cbdf in main () No symbol table info available. #0 0xffffe410 in ?? ()
2006-04-02 12:59:14 Sebastien Bacher gnome-panel: status Unconfirmed Needs Info
2006-04-02 12:59:14 Sebastien Bacher gnome-panel: assignee desktop-bugs
2006-04-02 12:59:14 Sebastien Bacher gnome-panel: statusexplanation Thanks for your bug. The backtrace is the same as http://bugzilla.gnome.org/show_bug.cgi?id=325783 upstream. Do you have a dual monitor setup? Could you get a backtrace with a debug build of libwnck (https://wiki.ubuntu.com/DebuggingProgramCrash)?
2006-08-14 15:40:43 Sebastien Bacher gnome-panel: status Needs Info Fix Released
2006-08-14 15:40:43 Sebastien Bacher gnome-panel: statusexplanation Thanks for your bug. The backtrace is the same as http://bugzilla.gnome.org/show_bug.cgi?id=325783 upstream. Do you have a dual monitor setup? Could you get a backtrace with a debug build of libwnck (https://wiki.ubuntu.com/DebuggingProgramCrash)? marking as fixed then, feel free to reopen if you get the issue again