When I call gameNetwork.init for openfeint I get a quick flash of a screen, coming up from the bottom of the app and then it disappears. It's so fast I can't even tell what it is, it kind of looks like an openfeint screen. So no openfeint login screen or anything, but the app doesn't crash. Any ideas?

My app is all setup in openfeint with leaderboards and achievements, plus I have my plist file in place for Game Center. I have not clicked "Enable IOS App" in Openfeint, I did not think I needed to do that until I was done testing, but could that be it?

I'm using:
Corona Version 2011.591 (2011.8.2)
building for iPhone running iOS 4.2.10
with Xcode 4.1

Thanks for any help or suggestions!

No, you don't need to submit/enable it until it's fully done.

I've built recently with OF and haven't had any similar issues myself. (I'm running the same version of Corona as you, too.)

Maybe try running it in the Xcode simulator to see if the log reveals any clues?

I'd double check your code too, just to ensure you are initiating OpenFeint at the right time and only once, and not doing anything else at the same time, (scene change, etc).