I have been using an addin I created for some time. Recently I have noticed when I open an excel workbook and the addin opens it adds the letter N randomly onto the excel worksheet I have opened and its never to the same cell. If I uncheck the addin and close my workbook and reopen it this no longer happens. I thought maybe the addin workbook got corrupted so I open another workbook and moved all the modules over to it and resaved it as my addin. Then I moved my xml code using the ribbon editor. The letter N still appears randomly. Can anyone offer any suggestions??