On my g/f's iBook, if we enable FUS and use it, the display blacks-out as if it went to sleep. Here's an example:
I wake-up her iBook from sleep. It asks for a password or to switch users. I choose Switch User. I enter my password. It switches to my already active account. Then within the first 10-seconds, the screen goes black and we need to hit the space-bar to wake it up. At that point, it re-asks for my password.
It does this for BOTH of us, whether we're logged-in or not, whether we use the pull-down or not, whether the iBook was asleep or not... FUS does not work correctly for us.
Are we alone...?