This is most likely a duplicate of either https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/789580 or https://bugs.launchpad.net/unity/+bug/709461.
This is most likely a duplicate of either https:/ /bugs.launchpad .net/ubuntu/ +source/ compiz/ +bug/789580 or https:/ /bugs.launchpad .net/unity/ +bug/709461.