I am unable to select any courses other than London. I was able to ride Watopia once or twice after my payment was processed but again am limited to London. Any hint as to what I am doing wrong?
Zwift provides one available course at a time. Here is the course schedule for January:
https://support.zwift.com/hc/en-us/articles/115000169883-Course-Schedule-for-January-01-17-
There is a change/hack you can make to your configuration that will allow you to choose a course; but you may not find many other riders on a course that is different from the current course on the calendar:
http://zwiftblog.com/world-tag/
You may want to search the forum for some of the many, many posts on this topic including discussion pro/con on allowing Zwifters to choose the course.