Tried changing to the most recent jQuery, still no joy. As I said, I have other working datapickers on this site which use older versions of jQuery & Bootstrap, but for some reason I just can't get this one to work. I've even tried stripping out Bootstrap JS & CSS files, still nothing. I'm still getting an error in the console, rate-calculator.php:34 Uncaught TypeError: $(...).datepicker is not a function but I don't know enough about Javascript to fix this (and line 34 is the standard Webassist datepicker script that works on all other pages anyway). Never had this issue before, it's driving me nuts!