Kevin, did you ever get this figured out?
I'm having a similar problem, but no solution yet. Have you tried to ssh to your server and open the website using a text based webclient, like lynx? When I try this, I get the following response:
Not Acceptable
An appropriate representation of the requested resource / could not be found on this server.
Honey Bee/1.0 Server at
www.servername.com Port 80
I'm wondering if this is because of Mod Security or Mod Evasive. Do you have either of these modules installed?
Regards,
Kas