Error 1018 - Active character

[Mullinstron]

So I figured this bug out or at least how to repro it. Not sure if any other conditions are causing it.

1. Log in your account on box 1
2. Exit the game but do not exit out of the client
3. Log onto box 2
4. attempt to load the same account on the same server

Result: The active character message appears

Maybe the server still has a token for you being active until your client closes?