All XLS Padlock Options > Security > Excel add-ins > Do not disable the following COM add-ins (enter ProgID):
By default, any existing Excel COM add-in is disabled when loading a secured workbook.
However, some useful add-ins like Microsoft PowerPivot may be required by your workbooks. In that situation, enter all progIDs of the different add-ins you want to keep in the field separated by semi colons:
For instance, for Microsoft PowerPivot, the ProgID are: Microsoft.AnalysisServices.Modeler.FieldList and PowerPivotExcelClientAddIn.NativeEntry.1
Learn more at http://support.microsoft.com/kb/291392/en-us
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