I have the following problem. I have two users on my Mac, me and my girlfriend. When I finished using it, I put it to sleep. When my girlfriend then wakes it up, it prompts for my password, so she picks Change user which brings her to the login screen. Then she selects her user and it starts and immediately after having started goes to sleep again. She then has to wake it up from sleep again which works, but is just a workaround. Any ideas?