Hi Barry (and Kelly),
I just noticed that Kelly wrote to me a few days ago on the same issue (however in a closed topic since September 17, so I cannot leave a reply there in turn). I just wanted to let you know that I upgraded to 3.2 and the problem persists. The backend datepicker still starts on Sunday (even though the WordPress settings says Monday). Kelly suggested that you might have inadvertently fixed this issue and she wanted me to confirm or deny, and I’m sorry to bring you the bad news, but no, you haven’t 🙂
Backend Datepicker