title: xcode hanging on startup and attempting loading previously force quit project
body: <p>i had to force quit a project.  Now when I try to open xcode, it attempts unsuccessfully to open that previous project and just hangs.  I cannot open any other projects.  I have tried the following with no success:</p>
  
  <p>restarting computer
  re-installing xcode
  clearing out Library/Developer/Xcode/DerivedData
  clearing out /var/folders/
  clearing out</p>
  
  <p>nothing has worked so far</p>