Worksheet_selectionChange does NOT trigger

For some reason Worksheet_selectionChange does NOT trigger. I even tried pasting it into a new book and making it run all macros. Is it not supported in 2010?

Option Explicit
 
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
    If Selection.Count = 1 Then
        If Not Intersect(Target, Range("D4")) Is Nothing Then
            Call MyMacro
        End If
    End If
End Sub