My keyboard doesn't work from the login screen, but when I login as a guest user it works fine (minus the brightness buttons, playback buttons, etc.).

I've already switched out the batteries and the keyboard works fine, so I fear it might be some sort of bug? All the methods of restarting or resetting certain settings can only be done from the login screen or from within an account, when the keyboard doesn't work, and the guest options are limited to non existent.

Try doing a SMC reset, you may need to do this 2-3 times as sometimes the reset doesn't always "take" the first time. To do a SMC reset, shut down the computer, unplug the power cord from the wall and computer, wait 15-20 seconds and restart normally and test. If after 2-3 resets it still does not work test another keyboard. If that keyboard works then this indicates your keyboard has failed and needs to be replaced.

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