I occasionally make icons for such things as hard drives. They usually require at least some transparency around the edges. In Mavericks, Photoshop CS5, both save as png and export for web produce icons with white where transparent should be. So do Preview, Fasticns, ImageAlpha, and Icon Composer. Going back to 8.5 and dumping a png with transparency onto Fasticns works just fine, and when I switch back to 9.1, open the icns in Preview, copy alll the views, and paste them onto a file's getInfo icon, I get a nice icon with transparency in Mavericks. That just seems a lot of work for an icon in the latest OS. Has anyone found a simple Mavericks-native method of creating icons with transparency ?