I have always had a UID of 1000 for my main account. After importing users into Leopard it disappeared in the login window! So I logged in as another admin user, unlocked the "Accounts" system preference and right clicked the account to get "advanced options". Then I changed my UID to 1001. That leaves my home dir unaccessible, so I opened Terminal and ran the command sudo chown 1001 /Users/myaccountname Now my account appears in the login window again.

What caused the login window to hide UID 1000?

Can this be used to reliably create a hidden account?

Is running the chown all I need to do after changing UID?

BTW What's the keystroke combination to get the "Other" password window when it isn't displayed in the login window's list?

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To get the user/password-fields just:

1. Select a visible user, using the keyboard (i.e. press the down arrow key)
2. press [opt]+[return]

Not my own work, but cribbed from this comment:
http://www.macosxhints.com/comment.php?mode=view&cid=64536

Tested on 10.5.2

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