I have just bought myself a new Mac and am finding the new OS a little alien at present. I've just downloaded a new background screen and moved it to the /Library/Desktop Pictures/ folder. However when I go to "System Preferences"->"Desktop&Screen Saver" none of my newly downloaded images are showing up for me to choose a new background image.
Any idea why this is happening as I was told that that folder was the default location where all desktop background images are stored (NB: I do NOT want to leave my newly downloaded images in any other folder but the default one)