inline datepicker previous month link not working

inline datepicker previous month link not working

When I click the prev(ious) month link nothing happens.  It shows normally and when I hover the mouse pointer over it, it shows the 'priv' tool tip.  On the same form I have three other datepickers, who's prev(ious) month links work normally.  I am using the latest JQuery UI datepicker in Chrome  Version 51.0.2704.103 m on a Windows 10 system.

The working datepickers all share the same options initialization  setting, which the inline date picker does not.  Here is the 'code' for the inline datepicker:

    <div id="calendarDiv"></div>
    <script>
      $( '#calendarDiv' ).datepicker( {
          dateFormat: 'mm/dd/yy',
          currentText: 'Today',
          numberOfMonths: 3,    // [ 2, 3 ]
          showCurrentAtPos: 1,
          gotoCurrent: true,
          changeMonth: true,
          changeYear: true,
          showButtonPanel: true,
          onSelect:function( dateText, inst ) {
            $( '#calendarDiv' ).datepicker( "option", 'currentText', 'Selected' );
            setDatePicker( 'calendarDiv', dateText );
          }
      } );
    </script>
    <script>
      function setDatePickerDate( whichDatePicker, newDate ) {
        $( "#" + whichDatePicker ).datepicker( "setDate", newDate );
      }
    </script>

Incidentally, in my inline datepicker's onSelect handler, when I tried using the inst parameter to change the currentText button's text, it didn't change the text, so I 'brute-forced' the change, as shown above.  If the inst contains the datepicker object, why wouldn't the following work?  

   inst.datepicker( "option", 'currentText', 'Selected' );

Thank you,
Howard Brown