On Wednesday I updated my iPhone 4 to iOS5 and all my 3rd party apps worked fine. Then on Friday when my iPhone 4S arrived I transferred everything over. The phone works great and all the core apps work fine, but none of the 3rd party apps work at all. They "blink" if I click on them but none of them will launch - even ones that have just been updated. I have a couple of key apps with years worth of data that I really can't afford to lose. I have done a hard reset. I have restored the software and restored from backup and still the problem is the same.

Any suggestions as to why this is happening and more importantly how I can resolve it?


3 Answers 3


Thanks for the suggestions but here is the answer:

The reason this happens is because every time a downloaded app is opened it checks for your itunes password for validation that you are authorized to open that app (as it may contain personal info). From time to time the iphone “forgets” your itunes password. You can fix the missing password by syncing the iphone with itunes or downloading an app from the app store and entering your password that way.

I am up and running with all my 3rd party apps now.


install another app from the app store... a free one will do. and then once you install that, then all of your apps will start working.. :) hope this helps

  • i faced the same today but i downloaded a new app put in the password and it worked thank you
    – user24135
    Commented Jun 18, 2012 at 12:15

When they blink that is the system trying to start them but then they immediately crash. But I don't know why.

If you can't run any third party apps this suggestion probably won't work, but if you can download and run the Console app from iTunes you can look at the system logs and see why your apps are crashing. That may help find a solution.

Another option is to install XCode onto your Mac and in the Organizer window you can see the system logs and crash logs on your Mac. Knowing what's wrong might help find a solution.

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