Be patient - the two issues aren't directly related (although present to a user the same inability to play the game!). The issue with the change world was originally caused by the change from one system of log-in to another. For the majority, but not all, it was resolved. The current issue, is as I understand it, a load balancing one at the data centre and not directly the development team (although I could be wrong about that!).
The people responsible worked last night to identify the issue and today to update software on servers which doesn't seem to have corrected the issue and has actually returned some of the log-in issues.
Hopefully, Friday 13th won't live up to it's name!