Password upon wake up?

I do not recall changing any settings on my Vista Home Premium (SP1 RC)
where I removed the prompt for the Password upon wakeup, but something seems
to have changed it.

I went back and reconfigured my 'power' settings to put things back to how I
wanted them. Is there any talk of any recent update that would change this
setting? If I changed this I really don't remember it. There have been two
updates in the last two days - one for the Junk Mail Filter and the other a
security update for Outlook (XP).

This isn't a major concern, I was just surprised that I was not asked for my
password when I woke up the computer. Just wondering. Thanks, DH