macOS 10.12.2 upgrade kills USB keyboard

I just spent the last few hours sorting out my mac. I accepted the latest os upgrade for my 2013 MacBook Pro 13 inch.
Then promptly lost use of my external USB keyboard.
The only way I can now use it is via my thunderbolt dock. Ie plug keyboard into the dock, and dock my MBP.
this was th solution after searching the web.

It seems to be something to do with the switch over to USB c , and a bug.

So just a heads up

That’s interesting. I didn’t have this problem with either of my keyboards. One’s an Apple keyboard, the other a cheapo Logitech.

For those that do get this pain in a… problem. The conversation of a few that have had problems like me
reddit link