Where does OS X keep it's cache of the background image? Here's the situation:
I have a firewire hard drive that I installed OS X on and applied the background I wanted. But then later on I decided to change it, so i booted my macbook pro off the drive and changed it. Now when I boot the macbook pro, i get the new image. But when I boot my old mac pro, it still shows the old image even though the file itself is long gone. There must be a cache somewhere but I don't see it.