The 3D client will no longer be usable on the live servers as of the client patch that is projected to go live on April 2nd. After that patch, the only clients that you will be able to log in with are the 2D client and, if you're a beta tester, the KR client on certain servers.

We apologize for the suddenness of this announcement - there are technical requirements we need to meet in order to continue with the KR beta testing process, and unfortunately meeting those requirements meant making changes now that the 3D client is not getting. We hope to be able to present our 3D players with the much improved Kingdom Reborn client as soon as possible after this change.