title: xCode 6 (beta 4) keep getting "The Simulator can't be launched because it is already in use."
body: <p>I keep getting the "The Simulator can't be launched because it is already in use." when trying to run my app, this only happens about 20% of the time but once so far the only way to get around it is to restart my Mac.</p>
  
  <p>Tried the following but doesn't help:</p>
  
  <p>Cleaning my build folder <br/>
  Closing and re-opening xCode<br/>
  Force close of simulator</p>
  
  <p>I'm Using xCode 6 (beta 4)<br/></p>
  
  <p>Any Ideas for a solution that doesn't entail me restarting my Mac?
  Thanks</p>