Can not export public pages in Windows x64 - 0.6.8

Under settings, editor, all pages public when publishing is greyed out permanently. Must make individual pages public. Even so, export graph, export public pages doesn’t work. I pick a directory for the exported graph, but when I click on the index.html file, a web page comes up, but no pages are listed. There should be two, titled “A” and “B”. There are no “A” and “B” pages under the assets folder under the directory for the exported graphs.