If you use desktop file managers such as PhoneView, iFunBox, iTools, iExplorer and others to browse app folders on your non-jailbroken iPhone, iPod touch or iPad, you have another reason to stay away from the latest iOS 8.3 update as it prevents those programs from functioning properly.
As first reported by Joe Rossignol of MacRumors, developers of these apps have confirmed that iOS 8.3 imposes additional restrictions on sandbox access.
In iFunbox, trying to access an app folder on an iOS device running iOS 8.3 produces a message saying “App Sandbox access is restricted by Apple to ones with iTunes File Sharing enabled since iOS 8.3”. This change does not affect jailbroken devices which can access app sandboxes as usual via OpenSSH for complete filesystem privileges and command line access.