When you join a server, the preview image for that map is the background for the loading gui. But when you don't have the map, it's just a white screen, which is annoying for me because the text in the loading bar is also white, so you can't read what you're downloading till it's more than half way loaded, not much of a big deal, but it annoys me. An image with a different colour so you can read the text would be helpful.
