Moving from jQuery UI 1.8.24 to 1.9.0 breaks sortable in my application. (If I change back to 1.8.24 it works again.) JQuery is at 1.8.2. Can't provide a sample.
I get an error "cannot call methods on sortable prior to initialization; attempted to call method 'enable'". I wonder if this has anything to do with this announcement from http://jqueryui.com/changelog/1.8.6/ "Removed: Don't throw errors for invalid method calls (wait till 1.9 to add this back)."