After quite a bit of digging I think I have it solved.
Our theme was loading its own copy of jQuery on the header.php:
<script type=”text/javascript” src=”http://code.jquery.com/jquery-1.10.2.js”></script>
which we use to have smooth navigation menus.
I moved this line to the footer.php and the menus are still working and now the calendar search ‘List’ view is working ! 🙂