Upgrade to iPhone 3.0 sdk and now simulator shows blank screen

Question

I have an iPhone app that uses an UITabBarController, which contains two UINavigationControllers, each of which in turn contains one or more TableViewControllers (actually,

Answer 1

I didn't have to change any alpha value settings. All I did was quit Interface Builder before trying to launch my project in the iPhone Simulator. For some reason if IB is open the first time you run the simulator it will give you a blank screen, so quit out of IB before running the project for the first time.