title: Custom functions not working in spreadsheet
body: <p>I've followed the instructions from: <a href="https://developers.google.com/apps-script/execution_custom_functions" rel="nofollow">https://developers.google.com/apps-script/execution_custom_functions</a> to create a custom function.</p>
  
  <p>Neither my functions or even cut and paste from the tutorial works: the functions aren't available to my spreadsheets. I've tried saving a version and publishing as a web app - with no change. I tried Google Chrome and Firefox, same result. Am I missing something really obvious here?</p>