I found post about same behaviour (Unity windows in background) in Ubuntu 12.10: http://askubuntu.com/questions/209518/unity-and-dash-displayed-under-all-active-windows
In my case "unity --replace" (temporarily?) fixed problem.
I found post about same behaviour (Unity windows in background) in Ubuntu 12.10: http:// askubuntu. com/questions/ 209518/ unity-and- dash-displayed- under-all- active- windows
In my case "unity --replace" (temporarily?) fixed problem.