I upgraded to Leopard a few days ago and copied over my keychain items and I've been able to read and send encrypted messages. However, just randomly, today I am not able to read encrypted messages. I got a new certificate and am now able to send encrypted messages to others and read my own encrypted messages, but I cannot read encrypted messages from anyone else. I have their certificates in my Keychain (from signed messages) so it seems like I should be able to. I have another "fresher" copy of Leopard that I used to see if I'm missing any other certificates, but I think I'm up to date. So how do I get it back so I can read these encrypted messages? I've been trying everything I can think of.