Application not launching on tappping the app icon on home screen

We have an application build for the several ipad users. The provisioning profile used for building this app has all the UDIDs. The application was working fine till last week. Now the users are facing problem in lanuching the app. When they tap on th开发者_如何学运维e app icon, the application closes immediatly without showing any screen. The users are facing this problem after 13th March which was the start of DayLight savings time.So is it because of that? or the provisioning file has expired? Also my developer id has expired march end. But the provisioning is valid till june 2011. Is it the expiration of developer id creating a problem. Need help..its production issue and i am not able to find out the exact reason.

It is a problem because of provisioning profile. Either it has expired or has been disabled from the provisioning portal.