Comment 7 for bug 660431

This is what i see just before the error:

Window manager warning: Log level 16: invalid (NULL) pointer instance
Window manager warning: Log level 8: g_signal_connect_object: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
Window manager warning: Log level 128: Active window is: NULL
Window manager warning: Log level 128: Switching to menus from XID 0
Window manager warning: Log level 16: gtk_menu_detach(): menu is not attached
Window manager warning: Log level 128: Looking for parent window on XID 77788022
Window manager warning: Log level 128: Switching to menus from XID 77788022
Window manager warning: Log level 128: Unable to get MWM functions for: 77788022
Window manager warning: Log level 16: invalid (NULL) pointer instance
Window manager warning: Log level 8: g_signal_connect_object: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
Window manager warning: Log level 16: invalid (NULL) pointer instance
Window manager warning: Log level 8: g_signal_connect_object: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
Window manager warning: Log level 16: invalid (NULL) pointer instance
Window manager warning: Log level 8: g_signal_connect_object: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
(mutter:5522): libunity-DEBUG: unity-appinfo-manager.vala:149: Monitoring extra app directory: file:///home/dbarth/.local/share/applications
Bug in window manager: Unexpected X error: BadDamage (invalid Damage parameter) serial 7449 error_code 168 request_code 153 minor_code 3)
Aborted