Ok the ground showing up Bright or "glowing" is a result of the two mask overlapping and trying to show two textures at once. To avoid this use the transparency feature of your drawing program to remove areas on the first mask where you want to have texture on the second mask to be. (this can be time-consuming)
As for the second issue, hard to tell. Have you set all available textures, as when you enter the mask names only the first texture is set to African grass, all others are set to black by default.