Option B workbooks are saved  with the the red “Macros are disabled” warning message visible in order to ensure that it is visible if you re-open the workbook with macros disabled.  As the workbook is being saved, the “Macros Disabled” warning will briefly appear. This is normal and intended.

When an Option B workbook is opened, a macro runs that reads some identity information from the registration form and hides the red “Macros are disabled” warning in the header area of the spreadsheet.