Datepicker not working

The jQuery datepicker is not working for us - the icon shows in FF and Safari (not Chrome) but does not show anything when clicked and the input box does not accept entry. In Chrome, it functions just like a regular text input but no icon. It's possible (likely?) that this could have something to do with the custom theme, but we're not sure how to chase down the culprit. All scripts appear to be enqueued correctly. Any help would be greatly appreciated.

Link: http://web.esm.rochester.edu/concerts/session/

Thanks for the quick response - it does work when switching to Twenty Ten (except in Chrome - still no icon), so it must be something wrong in our theme. Any further ideas you might have for troubleshooting would be helpful, but it's definitely not a Gravity Forms problem! Except for the Chrome thing, but I don't imagine you overlooked that originally.

Turns out it was a problem with some HTTPS stuff that was going on, so things are getting there. However, we're not using the Gravity Forms CSS and already have jQuery UI (both the JS from the Google CDN and our own customized CSS) included in our theme. Is there a good way to dequeue the included Datepicker UI JS without editing the Gravity Forms files? The included Datepicker JS doesn't grab all the classes needed for styling and is also redundant in our case. We've done this for now, in both places in form_display.php:

//wp_enqueue_script("gforms_ui_datepicker", GFCommon::get_base_url() . "/js/jquery-ui/ui.datepicker.js", array("jquery"), GFCommon::$version, true);
//wp_enqueue_script("gforms_datepicker", GFCommon::get_base_url() . "/js/datepicker.js", array("gforms_ui_datepicker"), GFCommon::$version, true);
wp_enqueue_script("gforms_datepicker", GFCommon::get_base_url() . "/js/datepicker.js", array("jqueryui"), GFCommon::$version, true);