Cannot click on Appointment (time) fields

Hi there,

I just implemented the latest version of Appointment + with Wordpress 4.1. Now I wanted to test the configuration, however, none of the field are click-able. I tried to identify any (Java) errors, without any luck. I've tried several web browsers.

Can you please have a look at the website? I've granted support access.

By the way, yhe website of WPMU says that the plug-in is compatible with 4.1. In contradiction, the plug-in says that it's compatible to WP 4.0.1.