Guys I have downloaded the 'pic lock' app from app store which is available for free . Receantly for the first time i tried to back up the apps on my itunes bt fr a strange reason the app has stopped workin after that(btw few of the apps stopped working ).

The icon is still there on the phone bt it just does not open .
The app really had sm important pics . Is there any solution to get them back ? Should i reinstall d app ? or is there any other way out to retrieve my pics ?