As stated by Christoph on https://bugs.edge.launchpad.net/ubuntu/+source/libwnck/+bug/374882/comments/5 this is working fine for him with a new user, not a bug but a configuration issue.
As stated by Christoph on https:/ /bugs.edge. launchpad. net/ubuntu/ +source/ libwnck/ +bug/374882/ comments/ 5 this is working fine for him with a new user, not a bug but a configuration issue.