MemberLists: What conditions prevent the loading of members?

I have two different MemberList files.

They both load without error.

With one file, I can see the members of the list, with the other, I can NOT see the members of the list.

I have looked at the line code in both EnumMembersInList sub-soutines.  I see no differences

File #1 that works

Sub EnumMembersInList()

If HS.Dimension = "Scenario" Then

  If HS.MemberListID = 1 Then

   HS.AddMemberToList "ACT_STAT"

   HS.AddMemberToList "BUD_STAT"

  End if

End If

End Sub

File #2 that does not work

Sub EnumMembersInLists()
     If HS.Dimension = "Scenario" Then
          If HS.MemberlistID = 1 Then
               HS.AddMemberToList "ACT_STAT"
               HS.AddMemberToList "BUD_STAT"