I have a very similar (maybe same) problem. My backtrace looks slightly different
(unity-window-decorator:9108): GLib-GObject-CRITICAL **: g_object_get_data: assertion `G_IS_OBJECT (object)' failed Program received signal SIGSEGV, Segmentation fault. 0x0000000000415bab in ?? () (gdb) bt #0 0x0000000000415bab in ?? () #1 0x0000003f2840e7fc in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0 #2 0x0000003f28420019 in ?? () from /usr/lib/libgobject-2.0.so.0 #3 0x0000003f28429258 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0 #4 0x0000003f2842941f in g_signal_emit () from /usr/lib/libgobject-2.0.so.0 #5 0x0000003f33c16d44 in ?? () from /usr/lib/libwnck-1.so.22 #6 0x0000003f33c173d4 in ?? () from /usr/lib/libwnck-1.so.22 #7 0x0000003f27042c2d in g_main_context_dispatch () from /lib/libglib-2.0.so.0 #8 0x0000003f27043418 in ?? () from /lib/libglib-2.0.so.0 #9 0x0000003f27043a5a in g_main_loop_run () from /lib/libglib-2.0.so.0 #10 0x0000003f2ed35827 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0 #11 0x00000000004097f2 in main () (gdb) I can trigger it reliably sending a mail from thunderbird. When the submission window (with the progress bar) closes unity-window-decorator crashes in 10 out of 10 cases. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/724874 Title: unity-window-decorator crashed with SIGSEGV in g_cclosure_marshal_VOID__OBJECT() -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs