A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
You have to pass the Target argument to Sym_Or_Sect_Change:
In the worksheet module:
Private Sub Worksheet_Change(ByVal Target As Range)
Call Sym_Or_Sect_Change(Target)
End Sub
and in the standard module:
Sub Sym_Or_Sect_Change (ByVal Target As Range)
...
End Sub