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This problem is indeed strange. On the Apple boards, some users re-installed their OS to solve the initial problem with certificates (something I'm not interested in at this point--especially if 10.4.9 will be coming out soon); others turned off certificate verification in Keychain.

I would like to know what's causing this, too, especially since it does not affect a majority of users. Oh, I also had issues with the iTunes store as well, namely, not being able to purchase music since the verification process was also messed up because of the certificate issue.