The caps lock key in my MacBook Pro (mid 2015, running MacOS Sierra 10.12) is not working. When I press it, the led doesn't turn on and it has no effect. However, if I logout from my account and go back to the login screen, then it works normally, which means it is some user preference setting. (by working normally I mean the led turns on and the sign of caps lock turned on appears in the password field)
The problem is, I have no idea what kind of setting it might be. In the system preferences, under keyboard, caps lock is assigned its normal function. I do have a few apps for remapping system input: Karabiner, BetterTouchTool and USB Overdrive, but I don't have any setting involving caps lock in any of them.