In Mountain Lion "invert colors" shortcut not working

I upgraded my shiny new macbookpro to Mountain Lion and the keyboard shortcut for "Invert Colors" (ctl-alt-command-8) stopped working. To re-enable this, go to "Preferences/Keyboard/Keyboard Shortcuts/Accessibility" and check "Invert Colors". (Apparently too many Windows users were visiting Apple stores and turning on the "Invert Colors" for all the machines)