so I have a late 2011 MBP running Lion and when I am looking at my desktops in overview, is there anyway I can keep them from rearranging themselves. For example I have 4 desktops with safari full page, I put safari in the middle of them so I can easily move back and forth, sometimes my desktops will rearrange themselves out of that order and I have to fix it. Is there anyway to prevent this from happening?