I am running Snow Leopard on a MacBook Pro. For some reason when I went to install a program upgrade it wouldn't take my password. So after a lot of mess I finally put in the install DVD and changed the password. Problem is that now every time I start up the computer I have to log in. Used to be that if I shut down I didn't have to log in when I started it up again. Now it always asks for the password. Any way to fix this??