I browsed the forums to see if this had been mentioned, but didn't find anything relative to my experience.
Fedora 16 64-bit (Gnome 3.2.1)
I use GNOME-RDP app to remote into my Windows box. Often times when I walk away, the auto-lock kicks in (fades to black). I would expect to type in a password after I wake it up, however, if my last action was within the RDP window, no password is needed. I have full access to the RDP session (if it hasn't timed out already).
If focus leaves the RDP window (after said scenario), the screen will fade to black immediately and prompt for a password.
This isn't a real "issue" for me, but, a curious observance.