Dunno if you figured it out yet but I had the same problem and it seems this update cleared the saved passwords for some.
What I ended doing was going to the super page and logging in using the admin/password from the docker creation page. My old account was still there so I just typed in the same password again and that got it working. I had some additional users in the admin page that I had to delete and add again since I didn't see anywhere I could update the password.