Use 1280x960, not 1280x1024. The former is a standard 4:3 resolution;

the latter is a popular but bogus 5:4 resolution.

stepmania/src/RageDisplay_D3D.cpp

@@ -413,7 +413,7 @@ bool RageDisplay_D3D::SetVideoMode( bool windowed, int width, int height, int bp
 		case 640:	height = 480;	break;
 		case 800:	height = 600;	break;
 		case 1024:	height = 768;	break;
-		case 1280:	height = 1024;	break;
+		case 1280:	height = 960;	break;
 		default:	ASSERT(0);
 		}
 	}

stepmania/src/ScreenGraphicOptions.cpp

@@ -53,7 +53,7 @@ static const int HorizRes[] = {
 	320, 400, 512, 640, 800, 1024, 1280
 };
 static const int VertRes[] = {
-	240, 300, 384, 480, 600, 768, 1024
+	240, 300, 384, 480, 600, 768, 960
 };
 static const int TextureRes[] = {
 	256, 512, 1024, 2048