Wow, that sounds really frustrating! Sorry to hear about all of the problems & then problems reporting problems.
Since you haven't gotten a reply yet on the developer forums, I'd suggest either the Customer Care email form -- http://emailcustomercare.amd.com/or if this was the form that wasn't working for you, here are phone numbers for technical support -- http://support.amd.com/us/contacts/Pages/global-technical-support.aspx
Thank you for noticing. It does not make any sense, but I uninstalled the driver and then reinstalled it. Since I got the same fault on two different machines, it seemed unlikely to be a corruption issue. But the driver is now working on both machines and I am left without any good explanation.