Just checking out there ... on just about all of the stations that have their logos on the bottom right have half missing. Only NBC which displays on the left is undisturbed. Anybody else have this 

What receiver are you using? Press the * to cycle through all different zoom levels, it might be that you have it on partial zoom.
unfortunately i dont know then. my Toshiba 30" HD CRT had the same issue but once i got into the service menu i brought the horizontal size in a bit and now its perfect.