Confirmed. It is server related, I had the same problem and contacted my host. They disabled the mod_security for my vanilla installation subdomain. Problem solved, but it leads me to another question regarding security. Is there any drawbacks with …
Same problem here.
"Page Not Found
The page you were looking for could not be found."
Google Sign In 1.0
Vanilla 18.104.22.168 on a subdomain.
OpenID 0.1a installed and working properly.
Any fix for the issue?