05-03-2009 12:46 PM
Glad its working. That is odd just installing another app fixed it. Normally its the other way around (having to remove a bad app) but you didn't mention just installing anyting right before it happend.
05-03-2009 12:50 PM
05-07-2009 9:29 AM
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 found that out during a call to Apple tech support.
02-11-2010 10:10 AM
One of the people at work had this happen to them as well. Installing a new app fixed it, as stated above. I've collected some of my search results and posted them on an article "Fix – IPhone app won’t start/launch/open".
Hope that helps some of you as well.
06-15-2011 10:23 PM
I just wanted to say thanks to all of you in this little forum. I was freaking out because nothing was opening on my phone either, but I was glad to see others were having the problem with relatively easy fixes. I didn't download a new application but had an upgrade (where it asked for my apple ID as mentioned above) so I did that first hoping for the best and it worked! So thanks a lot, this help me so much
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