Update: in GDM, the new account can logout fine and go back to the GDM window just fine. There is some problem with KDE 4.3 running as an upgrade (as opposed to a fresh install).
Update: in GDM, the new account can logout fine and go back to the GDM window just fine. There is some problem with KDE 4.3 running as an upgrade (as opposed to a fresh install).