Watch Parties in Moderation Panel
When using Moderator Panel, mods are not able to watch the movie (even they don't receive a notification when broadcaster starts a movie). I think in most cases mods want to see the movie when moderating (the chat is often less active because they only comment/react to scenes and they use some reward, like "drink water reward"). Now the fix is to open a new window/tab without the moderation panel. In that window you cannot manage rewards, activity feed, fast channel actions and requests.