Unable to run my app since the upgrade of Xcode

Question

Hi,

I made the update of Xcode to version 3.2.3. Since then my application won't start any more. Actually it starts with the spash screen and then I just see a black screen. The Framework where "red" so I hade to change the "Project format" form 3.0 to 3.2. CoreGraphics.framework was still in red. So I removed it and added it again and then it was not red any more. But the application is still not working!

Do you know why?

Thanks