When I went to login after accidentally logging off, my browser gave warnings that connection was not secure.
I'm using the latest Mac version (52.0.2 released 3/28/17) and I don't get any such message when logging out and then back in. Maybe it's a Windows issue.
Hope so, will test by changing password.
Edit: Seems to have resolved itself as I'm not getting any warning now.
They've been making lots of changes to this site lately. Maybe you were trying to log in while they were in the middle of an adjustment. I've been experiencing lots of little glitches that vanish a short time later.