I ran into this issue as well. I have a ar-300m that I was able to upload the ivacy openvpn files to and it asked me for the username and password, I then tried to do the same thing on the ar-750s and it uploads but unable to connect to the vpn. I was however able to use the ovpn files I downloaded from VPN Unlimited with the ar-750s without any issues. Still would like to be able to choose what vpn I do use and connect too.