So I just recently bought Jonathan Zdziarski's book on open iPhone Developement. The problem is, I cannot get any of the example to run on my phone. At first the program would not even show up on the Springboard, but after I installed BossPrefs from Cydia, it shows up. Now my problem is that when I touch on the icon to open the program, it zooms up to the screen as if the app is starting, The whole screen goes black (except for the menu bar at the very top) for about a second or two, and then the app will close and return back to SpringBoard. The app will compile fine, and I am using the ldid -S command to sign the app, and still no luck. I have tried 3 different examples, and all had the same result. Is there something common that I might be doing wrong? Any help is appreciated. I can post all the commands that I used to compile and put the app on the phone if it is needed. And I can also post the actual code from the examples if it will help figure out the problem. Thanks in advance for any help.