[Plugin: Events Manager] Event submission: calendar not popping up for date selection

I installed the Events Manager update a few days ago. I’m not sure if this is what is affecting my system.

In my events submission form, when you click the text area where you input the date of the event, usually a small calendar will pop up, allowing users to select the date visually. This is not popping up for some reason.

Help?

http://wordpress.org/extend/plugins/events-manager/