See also these bugs which may be related:
https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/737454
https://bugs.launchpad.net/ubuntu/+source/gnome-terminal/+bug/850649
See also these bugs which may be related:
https:/ /bugs.launchpad .net/ubuntu/ +source/ compiz/ +bug/737454
https:/ /bugs.launchpad .net/ubuntu/ +source/ gnome-terminal/ +bug/850649