I recorded 2 shows on the series 2 (single tuner, standard def video), same station. After transfer to my Mac, via iTivo, one shows as 640x368, the other, 640x480. The 640x368 show looks better when viewed on the Mac, and the full screen is visible. When viewed on a TV, it looks clipped on the sides. Pardon my ignorance, I thought SD broadcasts were all the same. What am I missing?