Been using Gameroom for about a year now after it getting suggested to me and I do agree that it provides a better experience than in browser. It runs smoother, you have access to the emotes that usually quit out of your browser/make a new tab and you don't need to have a whole browser open to play. I just launched it and noticed I had the same issue and my workaround is just zooming out with the buttons in the top right then making the game window larger or just playing in fullscreen mode. Also the ad Jarace was talking about is actually just the iClassic banner you usually see above the game.