Why are many options in gnome-tweak-tool inaccessible?

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http://askubuntu.com – When I run gnome-tweak-tool, a lot of the options are locked. In particular, I'm talking about the gnome shell theme, and the gnome shell extensions. They all have a "warning" type icon with an exclamation point next to them. I am not logged in to a unity session, just regular "gnome". (HowTos)