I have this problem since a long time with my menus. It seems related to FluxBox's menu. A line is wrong in /etc/menu/menudrakeentry, with title=""
When I delete this line or I put something in title, it works. In file "/etc/menu/menudrakeentry", at (or in the definition that ends at) line 17: [...] package="menu" section="Fluxbox/Styles/" title="" [...] ^ Missing (or empty) tag: title This tag needs to defined for the menuentry to make sense. Note, BTW, that update-menus re-arranges the order of the tags found in the menu entry files, so that the part above isn't literal