Google IPv6 SSL Certificate Problem

I have been accessing Google via IPv6 for the past few months thanks to the nice people at Hurricane Electric. Every once in a while when using Gmail, I will get a security error warning me that the SSL certificate for mail.google.com does not belong to that site (see below).  This only happens over IPv6. Today, I am being served a certificate for Google South Africa's domain.  I am clearly in China and my tunnelbroker.net IPv6 tunnel terminates in Fremont, California.  Anyone else have a similar problem?