Comment 2 for bug 813417

StacktraceTop:
 active_window_changed (screen=<value optimized out>) at /build/buildd/compiz-0.9.5.0/unity/unity_window_decorator/src/wnck.c:734
 g_closure_invoke (closure=0x15afc60, return_value=0x0, n_param_values=2, param_values=0x1861d50, invocation_hint=<value optimized out>) at /build/buildd/glib2.0-2.29.10/./gobject/gclosure.c:773
 signal_emit_unlocked_R (node=<value optimized out>, detail=0, instance=0x159e830, emission_return=0x0, instance_and_params=0x1861d50) at /build/buildd/glib2.0-2.29.10/./gobject/gsignal.c:3256
 g_signal_emit_valist (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>, var_args=0x7fffef93a2c8) at /build/buildd/glib2.0-2.29.10/./gobject/gsignal.c:2987
 g_signal_emit (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>) at /build/buildd/glib2.0-2.29.10/./gobject/gsignal.c:3044