Using OfficeXP.
In a fresh workbook from the immediate window...

This works.
Worksheets(Array("Sheet1", "Sheet2")).Visible = xlSheetHidden

This:
Worksheets(Array("Sheet1", "Sheet2")).Visible = xlSheetVisible

gives the following error

Run-time error '1004':
Unable to set the Visible property of the Sheets class

This seems like an easy one, but I haven't been able to find an answer.

Thanks,
-Jeremy