I recently reformatted my hard drive and reinstalled Vista as the operating system.
Now when I boot the machine, two logon prompts are shown. I noticed as I would start typing my password and then the textbox would lose focus. I was confused as to why this would happen until I noticed that when I press Alt-Tab, there are two logon screens available. One has focus on the Password box, the other doesn't.
I have never seen this before (I have reformatted several times previously without incident) and it is rather irritating. I'd like to find out why this occurs and how to prevent it.