Unable to Inseert Worksheets into Excel 2007
 

Hi Guys

I have a strange bug - I am unable to insert anymore worksheets into a excel
2007 workbook.

I currently have 8 sheets, and the workbook has no protection (that I can
find) active on it. But when I click on the insert icon nothing happens, and
the insert sheet menu item is greyed out

Any help would be appreciated