amc.com live stream not working

I've been having problems viewing the live stream at amc.com. I go to their live stream link, sign on, the video player starts to load with the message "video player loading" and then...nothing. I just see the buffering circle going round and round. I was able to watch their live stream a month ago but not now. I've always used Firefox so I don't know why it worked before but not now. I can watch live streams on other sites just not amc.com. I've contacted amc.com but they don't reply. I'm not even sure if this is a Firefox problem but I've tried other things (disabling ad-blocking, making sure my flash player is updated) to no avail. Any help that anyone can provide on this would be appreciated, thanks.