Cannot read property 'msie' of undefined – slideshow-shortcode.js

The jetppack slideshow no longer works on our sites. Here are two examples.

Here are two examples that we had to fix:
http://www.drkaplansky.com/office-tour/
http://www.estheticdentistry.net/your-first-appointment/

I’m not sure what broke the slideshow but we’ve had to manually add this to the theme to get it to work again.
jQuery.browser={};(function(){jQuery.browser.msie=false;
jQuery.browser.version=0;if(navigator.userAgent.match(/MSIE ([0-9]+)\./)){
jQuery.browser.msie=true;jQuery.browser.version=RegExp.$1;}})();

http://wordpress.org/plugins/jetpack/