I just checked it on the demo as you said the demo is not working either, but I found it’s working as it should be. If I click on the announcement, it’s opening a popup.
However, I can understand you are facing the issue on your site somehow. Maybe there is a conflicting issue causing the problem or something else. Have you checked the theme/plugin conflict yet? You can follow this to check-> http://www.thebengalboy.com/best-practice-find-wordpress-theme-plugin-conflicts/
If it doesn’t work even after checking the conflict, then contact our support center with your site credentials. We’ll debug the issue on your site.