Hello
Yes I had the same issue, the Xcode simulator App never seemed to get started when I tried to “build and open in Xcode sim”. Then I saw this post and tried to use Xcode to start the simulator manually then use Corona to “build and open in Xcode…”. now I can see my App in the Xcode simulator.
Perhaps this is something Corona can look at or provide info to everyone that the best method for this is to manually open the Xcode simulator first.
regards
bruce