It apparently is triggered by the compiz gird plugin, because the behaviour stopped when I deactivated it, if anyone is looking into it. The new version of this plugin is really buggy as it misbehaves in other ways. See https://bugs.launchpad.net/ubuntu/oneiric/+source/compiz-plugins-main/+bug/876591
It apparently is triggered by the compiz gird plugin, because the behaviour stopped when I deactivated it, if anyone is looking into it. The new version of this plugin is really buggy as it misbehaves in other ways. See https:/ /bugs.launchpad .net/ubuntu/ oneiric/ +source/ compiz- plugins- main/+bug/ 876591