I finally updated my 3GS to iOS4 last night and I'm really liking the new OS. It was pretty late when I finished, so I didn't get a chance to play with many apps so the problem didn't appear until this morning. When I'm connected to wifi, apps that need the network to update (Facebook, Twitter, App Store, etc.) work just fine. But if I'm on 3G (as I am at work...no wifi here), the apps just sit there when I open them. The App Store just displays a "loading..." message and does nothing. Am I missing something or is this a known bug? I did some searching, but I couldn't find a definitive answer. I'd really prefer to not have to restore the phone as the backup alone last night took nearly 2 hours. Any ideas would be greatly appreciated!