Unity dash completely empty all of a sudden. Howto fix?

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http://askubuntu.com – When I open my dash in unity (Ubuntu 11.10 upgraded from 11.04), it looks completely fine. Once I start typing though, all entries vanish and the dash is completely empty. It worked fine yesterday. Any ideas how to fix that? Can't think of anything, I changed. Here are some screens: Edit: Of course I tried this to no effect: sudo apt-get purge unity && sudo apt-get install unity (HowTos)