xfcs fc17 workspace switcher problems

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http://forums.fedoraforum.org – On my Acer Aspire the workspace shitfter stops functioning after some days/weeks/months. I can't change windows. Also I can't change number of workspaces in the preferences. I can change to any number but the screen still showes 4. When trying to to control applications (when open) by selecting from menu some applications closes the scroll menu. (HowTos)