[Plugin: The Events Calendar] More Information not displaying when clicked

I can add dates and details to the calendar, and they show up in red on the website as they are supposed to. When you hover over the red date, the event displays with “click date for more details”. When you click the date, nothing happens. I need for the event details to display again. I’ve been using this plugin on this site for two years with no problem. I haven’t changed anything. Can you help? Thank you!