Taken from the stackexchange forums:
http://gaming.stackexchange.com/question...lay-online
This should help anyone who changed their names and can't log into Dreamcraft. You'll most likely lose your items you had before the name change though. Nothing we can do about that if that's the case :[
Quote:It's caused by remaining logged in after changing your name. Not everything is updated.
You need to open the Minecraft client, log out, and log back in again (i.e. so you need to enter your user and password again). This should fix it.
http://gaming.stackexchange.com/question...lay-online
This should help anyone who changed their names and can't log into Dreamcraft. You'll most likely lose your items you had before the name change though. Nothing we can do about that if that's the case :[