The team got back to me on this, and apparently the root cause of this would be the use of Internet Explorer 9. Could you update to IE 10 or use another browser, and let me know if you still have the issue?
There seem to be other issues to do with login, but the link isn't established yet.
Sadly I use a Mac to play and Chrome as my preferred system, I set up a second account using firefox and all went well for quite a while. Now only world 53 on Chrome is available. In addition there is absolutely nothing displayed on main screen that indicates access to world 66 (Firefox account) or the ability to join any world.
when i click on change server, i get a screen with only my current world on it. please... i am on win7 using firefox. i cleared my cache as suggested by one user, to no avail. how can i get this screen populated with other worlds?