title: Xcode 5 says "Simulator in Use" when running 64-bit Unit tests
body: <p>I just downloaded and installed Xcode 5 GM seed.  I removed the previous Xcode (DP5).  When I open my project, select "iPhone Retina (4-inch 64 bit)" and type Command-U to run my SenTeskingKit unit tests, Xcode invariably complains: </p>
  
  <blockquote>
    <p>"Simulator in Use - The Simulator can't be launched because it is already in use."</p>
  </blockquote>
  
  <p>I have run xcode-select to point to the new Xcode, restarted my MacBookPro, and made sure there are no other iPhone sim processes running under the Activity Monitor.</p>