Addendum: Here you can find an impressive Screenshot about this issue:
http://askubuntu.com/questions/589552/black-spaces-around-windows-and-control-panels-ubuntu-14-04-unity-compiz-met
Addendum: Here you can find an impressive Screenshot about this issue:
http:// askubuntu. com/questions/ 589552/ black-spaces- around- windows- and-control- panels- ubuntu- 14-04-unity- compiz- met