I was just logging in to say the same thing. Trying to type something. It took the B. When I typed "s" instead of entering the "s" it brought up One Note. When I typed another letter, I forgot which right now, instead of entering it into the box it brought up the box where I select 2 monitors, extended, etc. Not sure what is happening. It MAY happen when I use Dameware to send a CTRL-ALT-DELETE but I am not sure about that.
To be clear, I log into my machine, Dameware to another machine, send CTRL-ALT-DELETE and try to login. At least that happened around the time today. I can't remember the last few times this happened, whether I had the same problem. Are you using Dameware? Have you received any responses? (BTW my desk is Windows 7 and Dameware machine is Windows 10)