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I can't save my dock and spaces setting. Every time I set them (eg. disable spaces), after I reboot/re-login to the system, the dock and spaces settings will revert back to the previous status. How can I fix this problem?

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Is your computer joined to a network domain with managed preferences? – Gordon Davisson Jul 10 '11 at 17:32
Yeah, this sounds exactly like MCX. Did you buy your computer used or new from the Apple store, or is it owned by a company you work for? – NReilingh Jul 11 '11 at 18:08
my os version is 10.6.8,and the system preferences works fine a month ago. One day, it sucks.I didn't join any network domain, I think this might caused by some wrong services setting.I shutdown down some system services as so called "optimize tips",maybe that's the problem. I will check them for solution. Thank you all! – user392412 Jul 12 '11 at 4:49
up vote 1 down vote accepted

I've solved it. Change the ~/Library/Preferences/ to be unlocked (get info, uncheck the locked label) and it will work fine. I don't remember when I locked it, but whatever.

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Don't forget to accept your answer. – CajunLuke Jul 12 '11 at 23:58

Try using a terminal command, like defaults to change your preferences. For elaboration, you may want to consider telling us exactly what you want.

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