title: Unable to drag and move around files in Project Navigator in Xcode
body: <p>I am unable to drag my classes (and other files) around in my Project navigator (Xcode 6.1), and I am unsure of when this problem began. It might have been when I updated Xcode from 6.0 to 6.1.</p>
  
  <p>I have been able to do this before and would like to be able to again, as I prefer to re-organize the structure of the project as it grows. I am also unable to create new groups since this happened. When I click "New group" I can see a new folder in the tree structure, but only for half a second before it disappears again. </p>
  
  <p>Can anyone help me with this?</p>
  
  <p><strong>EDIT:</strong></p>
  
  <p>This is not an issue if a create a new project, this is only happening in this particular project I am working on.</p>