Why am I not allowed to change any of the preferences in Finder's General preference pane, except for Spring-loaded folders? I am allowed to change any of Finder's Labels, Sidebar, or Advanced preferences, except for Show all filename extensions and Show warning before emptying the Trash.
I've tried deleting ~/Library/Preferences/com.apple.finder.plist then restarting Finder, which recreates com.apple.finder.plist, but the problem persists.
I'm running OS X 10.6.8.