It looks like it is still happening on 13.04, I used the workaround described in https://bugs.launchpad.net/gtg/+bug/1079589/comments/4 and it worked.
It looks like it is still happening on 13.04, I used the workaround described in https:/ /bugs.launchpad .net/gtg/ +bug/1079589/ comments/ 4 and it worked.