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I have a MacBookPro. one day updates started refusing to install because it said the certificate is missing or invalid and someone is doing a man in the middle on me. Same thing went for the Mac App Store - nothing won't install because of certificate invalid. Also xCode was refusing to sign my apps for the iPhone test deployment anymore.
I used a suggestion to start a new admin account and everything worked (updates, app store and xcode) but I liked my old and customized user. So I backed up the keychain from the old user (/Users/olduser/Library/Keychains/login.keychain) and moved the key keychain from the new user to there, setting the owner(using chown) to the old user. And everything started working on the new user, except the keychain access. The keychain access takes about 5 minuts now to load the login keychain after I select it, while System keychain is working immediately. login keychain works correctly after the 5 minuts.
These 5 minuts are annoying, is there any way to make it work immediately?

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Try to follow directions in this Apple KB article: Solving problems with keychains

If that doesn't make a difference, you can create a new keychain and transfer the passwords into it.

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The latter being incredibly painful... He should consider first changing the keychain passwords temporarily to a single character. – Daniel Beck Jun 11 '11 at 13:30
consider doing what? – Dani Jun 12 '11 at 19:07

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