I just downloaded and installed xcode4 with the latest SDK. I opened my project selected run and the simulator pulls up but stays black. All I see in the status window of XCode is 'Attaching to MyProjectName
Ios – xCode4 won’t run app in Simulator
iosiphonexcode
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Best Answer
check out my blog post for how to get around this -- basically you need to delete your xcuserdata for the project. http://hiediutley.com/2011/03/10/xcode4-is-your-old-project-hanging-in-the-simulator/