I was going to set up a tunnel from SixXS to prove or disprove that the problem is being caused by the HE tunnel or their interconnect with yahoo. SixXS is still providing tunnel service, but they are not accepting new registrations. I emailed their support and asked if they would make a temporary exception. The person who replied back lectured me that I should switch to another ISP if mine won't provide native ipv6. He was rude and obnoxious. I haven't experienced such unprofessional service in a long time. I have to say in all the years I've used HE, I've found the company to provide excellent support.