jQuery sortable Interaction

Had a simple ASP.NET MVC 4 app and decided to play with jQuery.  Tabs worked fine but 'sortable' lists and table-rows didn't drag or drop.  Turns out that I was including 2 versions of jquery-ui-xxxx.js scripts in my BundleConfig.RegisterBundles call.  took out the reference to jquery-ui-1.8.20.js and sortable worked.