The other day I went in and was trying to change my desktop settings to use some of my own photos instead of the stock photos that change every 5 minutes. Well, I got the photo to change, but it doesn't rotate every 5 minutes like I want it to now. When I go into System Preferences and click on Desktop and Screensaver, it freezes up and all I get is the rainbow pinwheel spinning and spinning forever. I can't even get it to change from the Desktop settings to Screensaver settings. It shows a thumbnail of what is now my desktop photo, 3 folder options, which I can't select, and in the preview window, it just says Loading Images... Any idea what I can do to fix this?