I have a visualforce controller that creates a list of related_addresses__c records, and when I try to access this list the apex:input fields don't populate any data. Any Idea why this would be happening? Could this be a Summer '13 bug?

VF:

<apex:page standardController="Pre_Delivery_Inspection__c" extensions="addRelatedAddressesController" sidebar="true" showHeader="true" showChat="false">
  <apex:form id="Related_Address_Form">
      <div style="width:600px; margin: 0 auto;">
      <apex:sectionHeader title="Add Related Addresses" description="Relate Addresses to a Pre-Delivery Inspection"/>
      <apex:messages />
      
      <apex:pageblock >
          <apex:pageBlockButtons >
              <apex:commandButton value="Save" action="{!save}"/>
              <apex:commandButton value="Cancel" action="{!Cancel}"/>
              <apex:commandButton value="Add Row" action="{!addrow}" immediate="false" rerender="table,error"/>
              <apex:commandButton value="Remove Row" action="{!removeRow}" immediate="false" rerender="table,error"/>
          </apex:pageBlockButtons>
          
          <apex:pageblockTable value="{!relatedAddresses}" var="a" id="table" width="600px">
              <apex:column headerValue="Related Addresses" >
                  <apex:selectList value="{!a.Address__c}" multiselect="false" size="1">
                      <apex:selectOptions value="{!RelatedAddressOptions}"/>
                  </apex:selectList>
              </apex:column>
              <apex:column headerValue="Address Type">
                  <apex:inputField value="{!a.Address_Type__c}" />
              </apex:column>
          </apex:pageblockTable>
      </apex:pageblock>
      
      <!--This is an example, and should be removed -->
      <apex:selectList multiselect="false" size="1">
             <apex:selectOptions value="{!RelatedAddressOptions}"/>
      </apex:selectList>
      </div>
  </apex:form>
</apex:page>

 Controller:

public with sharing class addRelatedAddressesController {

    //Class Variables
    public List<Related_Addresses__c> relatedAddresses {get; set;}
    private final Pre_Delivery_Inspection__c pdi;
    public String accountId = ApexPages.currentPage().getParameters().get('acctid');
    public String preDeliveryInspectionId = ApexPages.currentPage().getParameters().get('pdiid');
    
    public addRelatedAddressesController(ApexPages.StandardController controller) {
        this.pdi = (Pre_Delivery_Inspection__c)controller.getRecord();
        relatedAddresses = new List<Related_Addresses__c>();
        
        for(Integer i = 0; i < 4; i++){
            Related_Addresses__c initRelatedAddress = new Related_Addresses__c();
            initRelatedAddress.Related_PDI__c = preDeliveryInspectionId;
            relatedAddresses.add(initRelatedAddress);
        }
    }
    
    public List<SelectOption> getRelatedAddressOptions(){
        List<SelectOption> addressOptions = new List<SelectOption>();
        addressOptions.add(new SelectOption('', '--None--'));
        //Select Related Address Records
        if(accountId != null){
            List<Address__c> relatedAddressList = [SELECT id, Name FROM Address__c WHERE Account__c = :accountId 
                                                   AND Address_Type__c INCLUDES ('Title To', 'Register To', 'DOT Info')];
            
            
            for(Address__c address : relatedAddressList){
               addressOptions.add(new SelectOption(address.Id, address.Name));
            }
        }
       System.debug('Address Option Count: ' + addressOptions.Size());
       return addressOptions;
    }
    
    public void addRow(){
       Related_Addresses__c newRelatedAddress = new Related_Addresses__c();
       newRelatedAddress.Related_PDI__c = preDeliveryInspectionId;
       relatedAddresses.add(newRelatedAddress);
    }
    
    public void removeRow(){
        Integer i = relatedAddresses.size();
        if(i != 0){
            relatedAddresses.remove(i-1);
        }
    }
    
    public pageReference save(){
        //Validate fields before saving
        Integer j = 0;
        while(j < relatedAddresses.size()){
            if(relatedAddresses.get(j).Address__c == null || relatedAddresses.get(j).Address_Type__c == null){
                relatedAddresses.remove(j);
            }else{
                j++;
            }
        }
        insert relatedAddresses;
        
        PageReference back = new PageReference('/' + preDeliveryInspectionId);
        back.setRedirect(true);
        return back;
    }
    
    public pageReference cancel(){
        
        PageReference back = new PageReference('/' + preDeliveryInspectionId);
        back.setRedirect(true);
        return back;
    }

}