When I had my old receiver,everything played fine and full screen. I changed to the receiver to the Arcam AVR 600, and now it's driving me crazy trying to figure this out. When streaming video on Apple TV, everything is letterbox and not full screen, have black lines on top and bottom. With the Sony, all the previews in the dvd play fine and full screen, once the video starts, the screen shrinks and is in the upper left hand corner of the screen. Have no idea what to check. Anyone have any ideas? Do the video output settings need to be changed on both the Apple TV and the Sony? I posted this on AVS forums and have no replies yet. Thanks for the help.