I can create a regular cascading select, but when I convert it to an external cascading select the choices that are in the external_choices tab do not show up in the form. I believe I've followed the guidance provided here (http://xlsform.org/#external) and in the spreadsheet example it references, but I've probably got tunnel vision by now. Perhaps it's a bug? Source spreadsheets attached. I am using Excel 2013 on a Win 7 machine. Any suggestions would be greatly appreciated.