Iterator IsEOF returning true ... I am certain I am doing something dumb

I have this code which is trying to loop through the rows of a table variable. 

	var checkStaff = KeywordTests.InstructorInquirySmoke.Variables.Staff;
	var iterator = checkStaff.Iterator;
	var staffCode;
	iterator.Reset();
	while(!iterator.IsEOF)
	{
	  
		staffCode = iterator.Value(0);
		if (Staff.IsStaffExists())
		{
			Log.Checkpoint("Instructor " + staffCode + " exists.", "", pmNormal, attr, Aliases.browser.pageMain.Picture());
		}
		else
		{
			Log.Error("Instructor " + staffCode + " DOES NOT exist.", "", pmNormal, attr, Aliases.browser.pageMain.Picture());
		}
		iterator.Next();
	}

Iterator is not entering while loop. I am looking at checkStaff in debug watch. It (rightly) has 2 rows. iterator is showing as an object but with no details.

Can someone spy what I am doing wrong? I confess being the friday before a holiday I strongly suspect operator error.