Is there a list of "participating" theaters anywhere? I've tried a dozen browser combinations (Chrome, Opera, mobile, in and out of Incognito mode, 3 devices,

Is there a list of "participating" theaters anywhere? I've tried a dozen browser combinations (Chrome, Opera, mobile, in and out of Incognito mode, 3 devices, all with Javascript enabled for everyone) and can only get "Oops! Something went wrong!" with the map feature. I'd be fine with an ordered list but see no such option on their site.