KDE 4.9 Switching users. Sessions are not locked.

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http://forums.fedoraforum.org – Could anyone using KDE 4.9 (or 4.8) confirm this - when i switch user i expect my session to be locked when i get back to my own session, but it's not. Both users have lock screen activated (in screen saver menu), and still i can go to both sessions by Ctrl-Alt-F1/F2 without ever have to enter password. Would like to have this future though...did i miss some settings? (HowTos)