Apps Stopped Working and go back to the home page

Today suddenly my apps stopped working. When i would press them it would come up for a few secs and then go back to the home page. So i deleted all my apps on my ipod and figured i can dl again from my itunes. When i tried syncing the apps i got the msg: Some apps(all of them) were not synced because this computer is not authorized blah blah. I can Sync my songs/photos/vids fine. Can anyone help?

From the message you need to authorize the computer for the account that purchased the apps.  See:
About iTunes Store authorization and deauthorization
ALso make sure the iPod is also sign into that account.
You can also redownload the apps directly to the iPod if you have iOS 4.3 or later,  see:
Downloading past purchases from the App Store, iBookstore, and iTunes Store

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