I used to be able to use the Lighting to HDMI adapter to play YouTube videos on my friend's TV from my iPhone... however, just recently, it acts as if I'm mirroring my entire iPhone display to the TV even when a YouTube video is playing. Before, just the video would play on the TV and the iPhone would have a little video source icon in the YouTube app, indicating that the video was being played on the big screen. Now, the video plays on both screens at the same time and even shows enlarged controls on the TV and even TEXT MESSAGES pop up on the TV for everyone to see. I don't like this behavior and I want it back to how it used to be and just play the video on the TV and nothing else. I haven't updated my iPhone recently (still on 10.3.1) and I haven't changed any settings that I know of. YouTube has been updated recently, but I don't recall it mentioning anything to do with the HDMI adapter. Other built in apps, such as Photos and the TV app still play only the video on the TV. I'm guessing not a lot of people use the HDMI adapter, or maybe they don't think of it as a problem, but I preferred it when people couldn't see my incoming text messages while watching videos on the big screen.