I had the same problem, heres the fix:

1. Click on Tools-Macro-Visual Basic Editor
2. Double Click on "This Workbook"
3. Insert the Following Code:

Private Sub Workbook_Open()
ActiveSheet.EnableOutlining = True
ActiveSheet.Protect contents:=True, userInterfaceOnly:=True
End Sub

4. Click Save.

The Workbook_Open() routine automatically runs when the workbook is
opened. The next time you open the workbook you should be able to use
the grouping functions on your protected worksheet!


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joltinjoe02
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