Let me the also suggest position the item as you want to see it in the thumbnail, with transparency off, saving the set under another name, open the folder with Window Explorer and deleting the original RSR, delete the new CR2, rename the new RSR with the old RSRs name. It is still a lot of work you shouldn't have had to do, but it doesn't take very long. BTW, if your graphics card is set to 32bit color (not 24) the thumbnail will look like the "official" ones.