In my case, I was updating a post and got called away for a few minutes (maybe more). When I returned, my session had time out and I was prompted to log back in. I tried with the auto-filled login and pw, and that silly box shook itself ‘no’ at me. I did try other pw’s, but no luck. I then clicked on the Reset Password option, which was successful, but then my login email no longer worked – not a registered user.