I'm fast-user switched to the login screen. However, when I start to type my user name and password the keyboard input freezes before I am finished and I get the spinning beach ball and can't log in. Sometimes if I hit any of the volume buttons the keyboard unhangs and I am able to log in, but this time this isn't working any more.
This only seems to happen if I forget to properly disconnect a VNC client before switching to the login screen. I still have ssh but I am not sure what process to kill to resolve the problem. There aren't any processes running the look like a VNC server. I have looked for any process containing the substring "ARD", "VNC", "Lock", and "Remote" (case insensitive, e.g.
ps aux | grep -i ...).