I have a 4s and have just updated it to ios 7.1.2 then jailbroken it with pangu 1.1. It seemed to work fine as cydia was installed and working but no .ipa's would install. Ifunbox said the device was still jailed and to fix this i should install afc2add which i did. This fixed my inability to install apps but now none of the built in apps such as mail,safari or weather work. They just open up then immediately disappear. Any help would be most appreciated as although i can easily get by with 3rd party apps it's still puzzling. Cheers