Okay, so you were able to auto focus at f/10. That means the BH site's info is wrong.
Yes it did autoficus in Live View mode. It did "try" to autofocus in regular viewfinder mode but failed to focus correctly.
When I have time I will call the store I bought the TC from and ask them about this problem. I have not had that much free time today to do that.
I will keep you informed













