title: GUI Builder - GUI's Not Present / Disappeared
body: <p>I built a couple of UI's for a Google Spreadsheet using the "Build a user interface" function in the Script Editor yesterday.  Everything was working fine last night but when I opened the Google Spreadsheet I discovered that there are No GUIs present.  I'm just starting to learn how to work with Google Scripts and have a couple of problems.</p>
  
  <ol>
  <li>Is there a way to recover the information so I don't have to redo all of the work?</li>
  <li>Is this a common problem with the GUI builder tool? </li>
  </ol>
  
  <p>Any guidance you could provide would be greatly appreciated. </p>