I'm running Claws Mail version 3.7.4cvs1 on Vista 64bit and am seeing the same thing since yesterday (3/25). Sometimes I can pull mail other times I get the SSL has changed message box. If I accept the new certificate then try to pull mail again it says the cert has changed again and rotates back to the original certificate. If I don't accept, it terminates the connection with GMail. In the network log it registers an SSL Handshake failure. Does this have to do with the Iranian attack against Google and Skype?