rgros, what do you expect to appear in the left and right side of the image? Construct 2 will not change the aspect ratio and resize it wider, that would be terrible for many games. If you want the game to fill up the sides then you should draw it wider. But I think it does not matter because on an actual phone it will fit nicely.
cesisco - I assume you have the same problem. Does the phone aspect ratio match the aspect ratio of you game window? If not, then you'll need to draw your backgrounds and images wider to compensate.
For example, if you design your game for a square window at 400x400, then export it to a phone with a display twice as wide (800x400), what do you expect to appear? Stretching it twice as wide would look really ugly, so C2 scales it up and centers it. This means sometimes there's gaps at the side, and if you haven't adjusted your artwork to fit, the space will be empty.
Ashley, as i said before my layout is 960-640 window 960-640 and background 960,640 aswell,all designed to fit iphone resolution, thats why im asking this.