[Balanor]

This hasn't gone into affect yet, so it's not the player name limit causing your problem. You tried logging in using one of the shared/public/pirated CD Keys for NWN. Did you purchase your game from Good Old Games (www.gog.com)? If so, you can request a valid CD key from them by going to their site. The message you received when logging in give you the URL as well:

You are using a shared Neverwinter Nights CD Key. Because anyone can spoof your account with this CD Key, the Thay PW requires you to login again using a unique CD Key to keep your account secure. If you do not have one, you can go to the following site and request one:\nwww.gog.com/support/contact