I captured a few screen shots of how to fix it in case someone else has the same problem. (I got the instructions off of Tom's Hardware, but it doesn't have screen shots & isn't clear on some of the details.)
You might want to clip these instructions into your favorite notes software because:
- You need to do this for each USB port you plug into (though you only need to do it once for each & then you can unplug & plug back in without issues).
- You need to re-do it after major Windows updates, and it's hard to tell which ones will break it.
Good luck, fellow mechanical keyboard-enjoyers!