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Don’t panic!
It seems to be common to lose the right-button menu when you open the menu editor (I had a ‘Segment violation’ error). To recover it, open a terminal, and type:
cp /etc/xdg/xfce4/desktop/menu.xml ~/.config/xfce4/desktop/menu.xml
That’s all
Update: The directory could not exist. If you have problems create it first:
mkdir ~/.config/xfce4/desktop