Hi!
Let me say first of all that we’re very sorry you’ve experienced difficulties and we’d love to help if we can.
To the issue at hand, there seem to be some Javascript issues on the pages in question and I notice you are using version 1.7.1 of the jQuery library on your site (if you weren’t aware of this you may need to investigate the possibility that your theme or another plugin is responsible for this – it certainly looks like an external version, in this case hosted by Google, is being pulled in).
The Events Calendar/Events Calendar PRO expects the same version of jQuery as ships with WordPress for any of the currently supported versions to be present – and WordPress 3.6 is the oldest currently supported release. With that in mind, the version of jQuery you are using is effectively out of date and the first step I’d recommend here is resolving that and moving to a more current version that ships with a currently supported WordPress release.
Does that help at all?