Proxy settings won't save on Macbook Air (Moutain Lion 10.8.5)

Hi -- would love some help. I've been trying to configure proxies on my Macbook Air (Web Proxy and Secure Web Proxy) in order to connect to a specific network, but every time I make any changes in the proxy pane, and click OK, the changes are lost when I come back to it. I have been unable to connect to any networks that require a proxy. Would love some help! I'm quite puzzled. Anyone having the same problem?
Thanks!

Back up all data.
Triple-click anywhere in the line below on this page to select it:
/Library/Preferences/SystemConfiguration/preferences.plist
Right-click or control-click the line and select
Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with an item selected. Move the selected item to the Trash. Reboot and test.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination command-C. In the Finder, select
Go ▹ Go to Folder...
from the menu bar, paste into the box that opens (command-V). You won't see what you pasted because a line break is included. Press return.

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Decreasing battery capacity macbook air moutain lion to maverick

Does somebody have informations about the decreasing capacity of the macbook air battery when you pass from mountain lion to maverick.
I read a lot of things on different forums but nothing on the apple web site.
Many people had the capacity divided by 2.

Some are discussing it here
https://discussions.apple.com/thread/5478677?start=0&tstart=0
17 pages long.
But with Mountain Lion, some are discussing it here
https://discussions.apple.com/thread/4135250
227 pages long
I saw no drop in battery life with either, personally.
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== Operating system ==
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Change your settings in Sharing preferences, for one, and remove the server out of the Finder's sidebar. Obviously, this is the result of transfering all your other computer's preferences to your new computer.

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i never had issues my old mac/snow leopard, i just ran out of ram and the one usb broke, so i figured it's time. kinda sorry i did not just get the usb repaired and extra ram. what a hassle these migrations always are.
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maedi

Kappy wrote:
Yes, repairing first is a sound idea. In my experience I've only moved from Entourage to the OS X applications or from one version of Entourage to another. In the latter I've been able to just copy over the Microsoft User Data folder. But I have not used Entourage for quite some time.
Microsoft don't make it quite that easy to migrate to their own applications, but the import from a 'tidy' .rge file works well, I had a lot of issues with the first few I migrated but after performing a database repair prior to import all proceeded smoothly.

InDesign problems on Macbook Air running Lion.

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Tell my wife that!
This is the best I can do. This way you can use the 2011 MBA way to do things.
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dianefromdoniphan wrote:
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Proxy settings won't save on Macbook Air (Moutain Lion 10.8.5)

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