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'Your network settings have been changed by another app' - THE SOLUTION
This currently reported problem, which manifests after applying Security Update 2008-06, can be fixed permanently by removing the following preferences files:
Go to Library/Preferences/SystemConfiguration and delete the following (suggest make copies to the desktop first if in doubt):
Located looking here. This is on the main hard drive.
All these files will regenerate as necessary when the associated system features are accessed. If you're using Airport or Internet Sharing you'll have to reestablish the appropriate settings, because these will have been lost when the preferences files are removed. Small price to pay, however for a permanent, and very simple solution to this irritating problem.
There is this also.
The Library is found by opening a finder window in column view and clicking on the hard drive, then on Library, Preferences and scrolling to the bottom to find SystemConfiguration. All of the following items are in that folder. New ones will be created.