Same here.. Just tried to open and it wouldn't. I know they were doing some updating on the site itself, not sure if they had to temp disable the bots with the cleanup of their site. Give it time, I'm sure it'll be back up soon.
If the bot client wont load either try to re download and then run it, or just wait it out because there was an update; whenever there's an update you know the client will be down for at least 2-3 hours.