Simpler option: download and reinstall the last security update from
Code:
http://wsidecar.apple.com/cgi-bin/nph-reg3rdpty1.pl/product=05426&platform=osx&method=sa/SecUpd2005-002Pan.dmg
No need to edit any files. Or, if you prefer, there was a utility released by a third party today that claims to fix the problem. You can find it at
Code:
http://www.versiontracker.com/dyn/moreinfo/macosx/26431