After an upgrade, I have a DateRangePicker bind to null values, and the dates showed when opening the drop-down date selector are "January 1900 - February 1900". Previously (in 3.3), it was showing the current month and year.
It seems that a bug was introduced in 3.4.
After the 3.1 update, the OnChange event no longer fires. It fires only on Enter key press.
See this REPL link.