Sorry for spamming but I was too quick with blaming fusion-icon. In my case it is a problem between metacity and compiz like described in this bug: https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/389686
Sorry for spamming but I was too quick with blaming fusion-icon. In my case it is a problem between metacity and compiz like described in this bug: https:/ /bugs.launchpad .net/ubuntu/ +source/ metacity/ +bug/389686