Hi, we are trying to use Visualforce Charting in our Sandbox environment and are having difficulties rendering the charts. We can get the data to display but not the chart. The chart itself is blank. Below are our controller and page.  There seems to be a disconnect between the two.  Any ideas on what we may be doing incorrectly?

Does Salesforce Support need to enable the functionality in either the production or sandbox environment.

Controller:

public class vfcTimeToServe {

    // Get a set of Opportunities   

    public ApexPages.StandardSetController setCon {

        get {

            if(setCon == null) {

                setCon = new ApexPages.StandardSetController(Database.getQueryLocator(

                      [SELECT submitted_to_delivery__c,

                    assigned_to_start__c,

                                          negotiated_date__c

                                          FROM PLC_Job__c

                                          WHERE date_time_of_delivery__c= LAST_N_DAYS:90

                                          and Team_1__c = 'MCM-Market Research'

                                          limit 5]));

                setCon.setPageSize(5);

            }

            return setCon;

        }

        set;

    }

    public List<PLC_Job__c> getPLCs() {

         return (List<PLC_Job__c>) setCon.getRecords();

    }

}

PAGE:

<apex:page controller="vfcTimeToServe">

    <apex:chart height="400" width="700" data="{!PLCs}">

        <apex:axis type="Numeric" position="left" fields="submitted_to_delivery__c"             title="Days" grid="true"/>

        <apex:axis type="Numeric" position="bottom" fields="negotiated_date__c"             title="Month of the Year">

        </apex:axis>

        <apex:lineSeries axis="left" fill="false" xField="negotiated_date__c" yField="submitted_to_delivery__c"          markerType="cross" markerSize="4" markerFill="#FF0000"/>

    </apex:chart>

</apex:page>

Thanks,

Debbie