I had installed Cairo Dock In Ubuntu 12.04. But I configured the Cairo Dock and changed the view to Rainbow from curve. After changing to Rainbow view, the mouse stopped working. Even i could not shut down my pc. I have to power it off. Again i uninstalled it and tried to install again but same rainbow theme appears and mouse doesnot work.. Finally i uninstalled it, But why this problem is happening, i dont know. Can anyone has a solution of this??? Kindly reply.