My systems preferences is hanging
I started playing about choosing different backgrounds for my desktop and then all of a sudden I got the dreaded spinning wheel. Worse than: it won't go away. It says it is loaded images. I left it for over two hours, but it hadn't got anywhere. I did Force-Quit, restarted and tried again - now Systems Preferences>Desktop comes up with the spinning wheel. I have tried this three times now.
iMac, OS X Mountain Lion (10.8.4), May only relate to Preview