Comment 3 for bug 607681

Well.
0. To make experiment clean run all updates on your machine before you start ( to exclude situation when updated packages may broke cardapio).
1. Re-set cardapio to gnome panel. It should work fine and flawlessly.
2. Simply run terminal and start sudo apt-get update.
3. You will get cardapio working as I posted. you can press any categories and they not only will be empty, but also they could be pressed all together.

Anyway resetting cardapio helps.

I can post any command output you need.