switch user locks screen but doesn't switch user

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http://forums.fedoraforum.org – Hi experts Just moved from Fedora 17 to a fresh install of Fedora 19. When I click on "Switch user" in Gnome, it locks the screen, but doesn't switch to a new virtual terminal with the login screen, like it used to do in Fedora 17. Moreover, in that lock screen, clicking on "log in as another user" doesn't do anything either. To rule out user specific issues, I created 2 completely new users testuser1 and testuser2 and tried to switch from one to the other. No luck. Strace output of "gdmflexiserver -a" is attached. I can set kdm as the display manage (HowTos)