Sierra Beta: External keyboard won't type "a" and types an "i" instead of "h" after several seconds of being plugged in This is driving me crazy and I think I've done all the obvious troubleshooting. Where might OSX be keeping keyboard-specific settings that would do this?

Here's what's happening:


When I plug in the keyboard to either USB port on my MBP, it works fine for about 3 seconds
Then, the "a" key stops working (no response), and when I press "h" it types an "i" instead
It works fine when I boot in Recovery Mode
It works fine on other computers
Different USB keyboard works fine on this computer


Of note:


I am running macOS Sierra 10.12.1 Beta (16B2333a)
I recently installed and removed Keyboard Maestro
EDIT: I updated my machine to the latest Beta and I also got this issue. I resolved it by going to:

Preferences -> Keyboard -> Modifier Keys...  

And then "Restore Defaults".

This is a known issue in latest Beta.