FixedColumns sorting bug on jQuery UI themed table

I am attempting to implement FixedColumns and it seems to fail with the latest DataTables build. When clicking any sort header it doesn't properly update the header styling, the fixed column's <td> elements don't reorder, and I see a js error in console:

Uncaught TypeError: Cannot read property 'className' of undefined FixedColumns.js:796

I was going to send a link but noticed you have the exact same behavior on your example page: http://datatables.net/release-datatables/extras/FixedColumns/themed.html

Any help would be much appreciated.

Thanks!