Comment 2 for bug 751372

StacktraceTop:
 CompScreen::dpy (this=0x1) at /build/buildd/compiz-0.9.4git20110322/src/screen.cpp:504
 Launcher::OnUpdateDragManagerTimeout (data=0xa2b5e30) at /build/buildd/unity-3.8.2/src/Launcher.cpp:1714
 g_timeout_dispatch (source=0xa526150, callback=0x60b5260 <Launcher::OnUpdateDragManagerTimeout(gpointer)>, user_data=0xa2b5e30) at /build/buildd/glib2.0-2.28.5/./glib/gmain.c:3882
 g_main_dispatch (context=0x9b85f80) at /build/buildd/glib2.0-2.28.5/./glib/gmain.c:2440
 g_main_context_dispatch (context=0x9b85f80) at /build/buildd/glib2.0-2.28.5/./glib/gmain.c:3013