Totally puzzled and helpless (searched EE and Google with No results):
Win XP Home, SP2 fully up-to-date.
Admin user A changed the password for admin user account B and then logged off.
Selecting any of the user names in the Welcome screen opens the appropriate password input field. The field does not have an input cursor; clicking IN the field does not yield a cursor either. Machine has to be restarted to again be able to log on.
The user says that this has happened before, that is the password change mentioned above may be irrelevant.
Any helpful hints greatly are appreciated.