http://gambaswiki.org/bugtracker/edit?object=BUG.948&from=L21haW4- Comment #13 by Mufeed ALI: Hm... Then I guess it is an issue with Unity's global menu system. Well, the QT version does not face this issue. I'll try in XFCE. Could you make sure you're checking this in GTK3 and not GTK2? Thanks