xcode won't compile iOS apps, crashes when .xib or .storyboard files are opened

Question

I\'m running the very latest version of xcode (4.2.1). And I\'m signed up to the ios developer program.

When I create a new iOS Application for iPhone or iPad, using

Answer 1

I hate to say it, but it sounds like you may need to do a clean system install followed by a clean XCode install.

Or do you have another machine you can try a clean install of XCode on first?

If you can't just create a new project and run it in the simulator without it crashing you either have an issue with XCode or with your system. Since reinstalling XCode you still have an issue, I am afraid that leaves your system in question.