10.24 Our 9x9 had a hung session that we could not get to go away no matter what we tried. This morning we tried shutting down the system to kill the session. The shutdown process has stopped at "Shut 3" and will not go further. What should we do?

CTRL-B followed by RS. I've seen the same thing more than once. Sometimes these hung sessions will just not go away - even during the shutdown process.