I am an enterprise user and have used and tested the youtube component. That has happened to me as well however I attributed it to youtube. For some reason, you cannot stream any video and I am not sure why. Some videos would stream and others would not. I would always test the video first to make sure it would stream and then I would put it on the campaign. Also, depending on the source of the youtube video, they pull them down after a period of time which also causes the screen to go black.