Keyboard shortcut for Terminal doesn't work since updating to 12.10

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http://askubuntu.com – I have Ctrl+Alt+T assigned as my keyboard shortcut to launch a Terminal window, but it stopped working after upgrading to 12.10. I have verified that it is still set in the Keyboard Shortcuts settings menu, and have verified that other shortcuts (e.g. Ctrl+Alt+C to open calculator) work. I have also tried using assigning different key combinations to Terminal, to see if that helps (it doesn't), e.g. unassigning Ctrl+Alt+C from calculator, and instead assigning it to Terminal. No dice. Any ideas what might be going on? (HowTos)