Currently the arean-chooser doesn't update when an arena is in "closed" state. It updates ping times for running arenas, but what's "closed" stays "closed". The only way to see a "closed" one as active is to quit and enter again.
It would be nice if "closed" areans would be displayed as active automagically once they are no longer closed.
Maybe its also possible to distinguish "closed" in the sense of "rebooting, and will be up very soon", and "closed" in the sense of "closed, because an admin has closed it for an undefined amount of time"?