Unable to use console (agetty) after Gnome login

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http://forums.fedoraforum.org – I have a strange problem and after googling around I haven't found a solution... When I boot to the desktop manager (kdm in my case) I am able to use tty consoles by pressing Ctrl+Alt+Fn. If I next log into XFCE I am still able to use them and everything is fine. But if I log into Gnome the consoles are not available anymore. Pressing Ctrl+Alt+F2 results in black screen and my monitor going sleep. If I now log out of gnome back to kdm the problem persists. It also persists after X server restart (Ctrl+Alt+Backspace) and whatever I do I am not able to use text consoles until the next reboot (HowTos)