Fedora 18: KDE krashed

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http://forums.fedoraforum.org – Hi! I am running the KDE spin of Fedora 18. When I rebooted a couple of hours ago KDE wont start. I get the login screen, but after logging in it freezes at the "Starting kde" screen (harddrive, wrench, globe, ...). The command Alt+c works, and i can run none KDE applications such as xterm and firefox. But when I try to run KDE applications such as Konsole or KCalc: they start but only appears as empty windows. Both these applications prints the same error message in the console: X Error: BadShmSeg (invalid shared segment parameter) 128 I cant think of anything strange (HowTos)