title: Google App Script onFormSubmit trigger not firing
body: <p>I have a script to run a function when a Google Form is submitted, and a new row added to my google spreadsheet. Alas, it fails to trigger. There is no error reported and I don't receive a notification email. The function works when executed manually, and new rows are added to the spreadsheet as expected when a form is submitted.</p>
  
  <p>I have installed the trigger through the resources tab, to run onFormSubmit() when theres an event on the spreadsheet. I have tried onChange and onFormSubmit, both with no response. The on edit trigger works as expected when I manually edit the spreadsheet. The simple function it should run is below.</p>
  
  <pre><code>function onFormSubmit() {
  Browser.msgBox("Success")
  }
  </code></pre>
  
  <p>Any pointers would be greatly appreciated, thanks.</p>