Right now I can see Fletch Lives in 1280x720 on 562, full screen (16x9). What do you mean by "letterbox"? I take that to mean wide screen with black bars on top and bottom. Old movies not in 16x9 HD will show 4x3 with black bars on the sides unless you zoom to fill the screen and cut off the top and bottom. You don't mention which box you have.
As for that other channel (564) Rogers has lately been adding teaser channels as free previews and hoping you'll pay to add them when they disappear. I noticed that with Discovery Velocity.