"Work" tab in "Lubuntu Netbook" session is messed up

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http://askubuntu.com – I have just upgraded my laptop (Samsung NP300E5A, with 15.6" 1366x768 LCD) from Lubuntu 12.04 to Lubuntu 12.10 (full reinstall). I used to use "Lubuntu Netbook" session (one of choices that login manager offers). It shows installed programs not only in "start menu", but also full screen in tabs: "Internet", "Work", "Learn", "Play", "Preferences". Some of those tabs are divided further, like e.g. "Work" tab which includes among others "Work > Accessories" and "Work > Office" subcategories (sub-tabs). After installing a few programs Lubuntu Netbook now has totally messed up "Work" tab, and o (HowTos)