Version: (using KDE 4.2.2) If display settings are set to automatically lock after a certain amount of time, then this should be respected if the elapsed idle time is reached when in present windows mode. I use present windows to see an overview of all my desktops, and occasionally walk away from my pc to do something else. It would be ideal if locking could still occur. I do not know if this is also a problem with other desktop effects (like cube, expose thingy etc)
*** This bug has been marked as a duplicate of bug 78871 ***