I have an XLS file that has first name, last name, and email address. When I do an import from the My Guest List page, the preview shows all the entries fine, but when I click Save, it goes back to the Guest List Manager page and none of the ones I tried to import are showing up. I've done it twice; it only shows the 4 names I've added manually. Does this function work? If so, where did the names go?