When I launch my iOS App under Xcode 7 beta 2 in the iOS 9 Simulator, the Simulator launches, shows the Apple logo with a progress bar, progresses to complete and then just shows the Apple Logo. I'm not getting any error message, but my app never actually runs in the simulator and I never see anything but the Apple logo against a black background. My app previously ran fine in the simulators under Xcode 6.
What do need to do to get my app to launch in the Simulator under Xcode 7 beta?
Are you using an external display in the simulator (ie. a simulated one from the Hardware > External Displays menu in the sim)?
This was the culprit for me: https://forums.developer.apple.com/thread/3890