It's possible that it's an AutoStart problem. In 2.4.6, videos played automatically when you double-click them but in 3.0.0 they do not. You can either click the Play button under the video in the Live section or right-click on the video in the Service list and choose AutoStart. After that, when you double-click the video it will start playing.
Personally I'd rather the videos play automatically but I don't see a way to do this in settings.