Okay, so i have an iphone 3gs, jailbroken. I kept trying to open the original Apple Apps store to install an app and after clicking "install" it would flash and bring me back to the springboard. After syncing my phone, now when i try to open apps like Facebook, ESPN, or Twitter, (basically any app that didn't come already installed on the phone, EXCEPT those i installed through Cydia), they all just flash and go off, just like the app store. I've tried re-syncing and reinstalling the apps, but i can't because my app store won't let me. Help Please. 