In your Demo select PivotGrid - OLAP Support

1. sort rows by "Reseller Order Quantity"
2. reopen sorting panel
-> another option will be selected In the sorting options dialog, the selected column in the sorting options appears to be set to a wrong value upon reopening the dialog.

In your demo select PivotGrid - Olap Support

1. add "Exchange Rates: Average Rate" to values
2. sort rows by "Reseller Order Quantity"
-> The grid will be empty

 

If the list is filtered by "Total Reseller Order Quantity != 0", results will show again. Thus, sorting by a column which contains rows without values seems to be faulty.