Comment 6 for bug 1125442

I have what looks to be the same or a related problem. I experience it in a variety of instances, however the most recent example is in using jitsi - a softphone. I receive(d) a call in jitsi, I answer it. I then switch workspaces. When the call is terminated, I have to go back to jitsi and click on it in order to regain control of my mouse. ubuntu 12.04 with KDE/kubuntu-desktop.

apt-cache policy kubuntu-desktop
kubuntu-desktop:
  Installed: 1.254.1~ppa6
  Candidate: 1.254.1~ppa6
  Version table:
 *** 1.254.1~ppa6 0
        500 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu/ precise/main i386 Packages
        100 /var/lib/dpkg/status
     1.254 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main i386 Packages