Sitemaps empty and unable to edit selectors

Web Scraper version: 0.3.8.5
Chrome version: 71.0.3578.98 (Official Build) (64-bit)
OS: Windows 10

I went today to open up a sitemap I created last week and the selectors are gone. Further, I am unable to add selectors to this site map nor am I able to use the "Sitemap" drop down menu, nothing happens when I click on it.

Not sure if this is a bug or I just screwed something up.