I have several free apps and when installed worked fine.Yesterday I tried them all and they seem to boot, show there play screen and reverts to main menu screen in about 2 seconds.Apps such as Tap Tap Revenge and pandora etc. don't function correctly now. I did load some movies yesterday and in the middle of loading them while syncing I inadvertently halted the sync of them but restarted and they are fine to watch now. I did nothing else. My first Ipod and I know very little about how these work. Thanks for any help in fixing it Fixed:don't know what I did but I went to the App store and downloaded another game--Pac Man-- and everything else was up and running again. If anyone can explain this still reply since I would like to play these at work and can't update from there.