Some of you might have noticed (if you play on a WOTLK private server or sandbox, either OpenAscent WOTLK, Mangos Sandbox, Mike Crowe's Repack, or FrozenAscent) that errors have been coming up lately!
Although, not everyone gets these errors.
If you have downloaded the recent WOTLK Patch (Build 8471) then DOWNGRADE! If you still want to play WOTLK Private Servers.
This patch has changed the way that characters are read form the server. It is still unknown what this new system is - Myself and my team are looking into it however.
This might be the one good thing coming out of Alpha servers - being able to decipher Blizzard's client->server relationship changes before the big expansion, saving us work in the long run.
Cheers,
Hellgawd