I also believe that "expanding cache" is no longer functioning. In a previous release(many releases back) I could see buffing occur while I watched a video that was playing from my hard drive. If I paused playback, I could watch the amount of the video loading into the buffer, to the point where the whole video was in the buffer. This was nice because my hard drive is a little noisy, so after the entire show was loaded into memory cache, I could watch the show without any background noise, and no blinking light from hard drive. This is no longer working, it only seems to pre-load a very small amount and the hard drive is active throughout video playback.