I just got my Ipod brand new today. I downloaded some apps onto it and played them for a while. Then, later on, I shut my Ipod off completely and left it alone for about a half hour. When I turned it back on and tried to use the apps again, they wouldnt work! They would just open up, show the start screen, then close down! I'm not sure what is wrong, but if you could help, it would be greatly appreciated!