Gday! First post and thought this might be helpful. This mainly concerns people who use GIMP editor to draw their .png maps. There's a little setting that frustrated the hell out of me. If you've ever made your map too small or too large and need to scale the image, GIMP has a nasty habit of blending colours between edges. This naturally causes there to be pixels that WorldEd can't handle. To prevent this make sure to set the Interpolation drop box to "none".