Gray borders appearing at roGridScreen while on HD

I get a horizontal line right around the 138 pixel mark (the limit for the overhang) on 1080p but not 720p, when the overhang and the bkgrnd were the same color. As you say the solution is to make the bkrnd color black, which i didn't consider much of a solution. The fact that you can't theme the text in the one configuration where text can appear under the thumbs tells me Roku would like you to have a very dark background on your grid.