Internet Sharing Suddenly Won't Work Anymore

Internet sharing was working for several days before. My macbook is connected via ethernet and I turned on airport so I could get wifi on the iphone.
Later that day, it suddenly stopped working. I tried restarting my computer several times to no avail. Everytime I set the preferences for internet sharing, it will say it's sharing but it actually isn't. When I close the window and open it again, it's automatically reset to not sharing the internet.
Help please?

No one can help me with this???
More info: I realized my Shared folder on the Finder sidebar is missing. Anyone know how to get it back?

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If you specify a static IP address, can you connect to Internet?
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Internet Sharing Suddenly Won't Work Anymore

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