Just tested its indeed a duplicate of bug 655241 I have built appmenu-gtk in my ppa with the patch from bug 655241 and it fixes the problem.
you can simply install this file https://edge.launchpad.net/~om26er/+archive/test/+build/2006157/+files/appmenu-gtk_0.1.9-1ubuntu1_amd64.deb or use my ppa https://edge.launchpad.net/~om26er/+archive/test
Just tested its indeed a duplicate of bug 655241 I have built appmenu-gtk in my ppa with the patch from bug 655241 and it fixes the problem.
you can simply install this file https:/ /edge.launchpad .net/~om26er/ +archive/ test/+build/ 2006157/ +files/ appmenu- gtk_0.1. 9-1ubuntu1_ amd64.deb or use my ppa https:/ /edge.launchpad .net/~om26er/ +archive/ test