When an Option B workbook is opened, a macro runs that reads some identity information from the Registration form Control Center and hides the red “Macros are disabled” warning in the header area of the spreadsheet. In Excel 2010 only (not in other versions of Excel), this macro runs only if Excel is already running when you open the workbook. Therefore for Excel 2010, we strongly recommend that you start Excel 2010 before opening an Option B workbook. | 
