OS X provides a variety of services that can make use of various key combinations to better implement their features. There are a number of possibilities why the system will not recognize input, including if you are using various system services that reserve commands and keys, if there are any corruption in plist files that contain keyboard settings, or quite commonly if the foremost application has been developed to override system keyboard settings. While you can do this with fast-user switching enabled, it would be preferable to log out of your current account first to prevent any chance of active processes from interfering with the new account's settings. To test this, try creating a new test user account in the "Accounts" system preferences, and log into that. In most cases when this happens it's account-specific based on settings, but may be global as well if the keyboard hardware is not being recognized properly. If this is the case, you may find that either specific keys will not work, or certain combinations of keys will not work. Sometimes modifier keys on the keyboard may not work properly.
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