Can you try logging into your site with a different browser, and see if the scan results appear? You don’t have to start a new scan — just viewing the scan page should show the existing issues, if it was a browser problem. I have heard of some unusual problems with Chrome lately, and usually they are fixed in the next Chrome update.
If it does work in another browser, do you have any extensions or add-ons installed in your regular browser? Some extensions can interfere with scripts, which could cause the issue.
If not, it may still be a conflict with another plugin or the theme. If possible, can you temporarily disable all other plugins, and switch to a default theme like “twentyfifteen”, and see if the scan results appear then? (If your site has a lot of traffic, of course, you may not want to do this during peak hours, and some plugins may require setup after they’ve been disabled.)
-Matt R