I have a program that auto updates a cell in several worksheets of a workbook
when a value is changed on another worksheet in the same workbook. The
program works flawlessly on my computer; however, when a colleague opens the
workbook and the program is triggered he gets an Invalid Outside Procedure
Error. He has the same VB references and excel addins active that I have.
Here is the code.

Private Sub Worksheet_Change(ByVal Target As Range)
'
' Auto update Rev Level and Date when a change is made on the rev guide sheet
'
'== Declare Variables
Dim iRevLevel As Integer
Dim dRevDate As Date
Dim ws As Worksheet
'==
'== Get the latest rev level and date from Rev Guide Worksheet
iRevLevel = Worksheets("Rev Guide").Range("A1").End(xlDown).Value
dRevDate = Worksheets("Rev Guide").Range("F1").End(xlDown).Value
'==
'== Loop through all worksheets and update rev level and date
For Each ws In ActiveWorkbook.Worksheets

If ws.Name < "Rev Guide" Then
ws.Range("M3").Value = "Rev. " & iRevLevel
ws.Range("K3").Value = "Date: " & dRevDate
End If

Next ws
'==
End Sub

Any ideas? Thanks in advance