App switching (cmd-tab) and Expose stop working

This has happened to me several times in the last couple of days: Suddenly the cmd-tab command for switching applications stops working, as well as my active corners for Expose. No matter if I use the laptop's keyboard or an external one. After a restart everything works again. Any ideas?

I'm having the exact same problem. I think it may be somehow tied to the new update of itunes (9.0.1) because when I try to cmd+tab after open itunes it activates tabbing within the itunes fields.

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