I have added a new known issue that causes the Gameguard Error 114 message. It appears that since the update of Gameguard introduced for Closed Beta #3, the Aion installation of Gameguard may now be seen to conflict with other installations of itself. This was seen today with a user who also played Rappelz, which is a game that also uses Gameguard. The user disabled the Rappelz installation of Gameguard and the problem was resolved.
To disable the other installation of Gameguard, the user used the steps described in
this post, and found the Rappelz installation of Gameguard appearing in the "services" tab as "nProtect Gameguard". Disabling this one process by itself in the services tab solved the issue.