gnome-tweak-tool settings won't apply

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http://askubuntu.com – I change something in gnome-tweak-tool, but it won't apply. If I close gnome-tweak-tool and start it again, the settings are same as before. Do you have any idea how to solve this, please? I'm using Ubuntu 11.10 with GNOME 3.2.1 and Unity (but that's not relevant, I think). Thanks. :) (HowTos)