title: MonoDevelop is Removing My Reference to System.Drawing (Unity)
body: <p>In one of my scripts it is required that I reference System.Drawing. However it seems every time I start up the project and enter Mono it's removed the reference and I need to re-add it.</p>
  
  <p>All my other references stay where they should be, any particular reason this may be happening or how I would prevent it?</p>