The following "fix" helped me to get rid of the problem on Skype, Quassel and other Qt based applications, making them usable:
https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/269904/comments/215
The following "fix" helped me to get rid of the problem on Skype, Quassel and other Qt based applications, making them usable:
https:/ /bugs.launchpad .net/ubuntu/ +source/ compiz/ +bug/269904/ comments/ 215