It turns out that you need to be running PHP5.6 or higher in order for the spreadsheet export to work. I was on 5.4. When I updated to 5.6, everything worked.
Thanks to Etoile Web Design for a quick response to my offline email. I now understand that the plugin is using PHPSpreadsheet starting with 3.2.0 and there was an interaction with a diffrent plugin I had enabled that tried to use PHPExcel. Thanks again.