Until recently, I had noticed a demo.app in customize and thought nothing of it. Yesyerday, though, I turned on my iPod and the iconas were in the worng order. This was easy to fix, but now I see an application named "demo" on my main screen. When I open it, I see a blank, black screen, like it's frozen. But hitting the menu button brings me back right away. Is is ok to delete this app?