when the Apple TV was new, I could scrub forward in a stream with a little preview of where I was scrubbing to or scrubbing back to, just by sliding my finger left and right on the controller. This only works sometimes now. What is the trick to doing this consistently? I was just watching infuse today and I wasn't able to scrub at all, had to click the touch area, scan forwards, and click again to play. Any advice? A setting I'm missing?