what values my Custom Salesforce Visualforce edit page does not show?

I have a simple edit page on a custom object with a ‘simple’ controller extension (as I need a custom save method). However .. the VF page does no show any values …. (and no error).

Public Account MyAcc { get; set; }
Public Account_PriceBook__c acc { get; set; }
public Account_PriceBook__c AccPB { get; set; }

//** Class constructor (Always loaded ....)
public DEPT_AcContPcBControllerExt(ApexPages.StandardController Controller) {
acc = (account_pricebook__c)controller.getRecord();
String modeStr = ApexPages.currentPage().getParameters().get('Mode');
TextDescription = '';

system.debug('*** ** *** Record id'+Acc.id);
system.debug('*** ** *** Mode'+modeStr);
if (acc != null && acc.Id != null){
Account_PriceBook__c AccPB = [SELECT id, Price__c,Account_Lookup__c,Description__c, AgencyLookup__c,Product_Lookup__c,marge__c from account_pricebook__c where id = :acc.id];
system.debug('*** ** *** Account id'+AccPB.Account_Lookup__c);
system.debug('*** ** *** Description'+AccPB.Description__c);
MyAcc = [SELECT id,name FROM account WHERE id=: AccPB.Account_Lookup__c LIMIT 1];
system.debug('*** ** *** Account Name'+MyAcc.Name);
}
} //** End of constructor

The VF page outputfield (or input) shows no value …

<apex:pageBlockSectionItem >
<apex:outputLabel >Product</apex:outputLabel>
<apex:outputField value="{!accpb.Product_Lookup__c}"/>
</apex:pageBlockSectionItem>

So … I must be overlooking something .. but what …