This is an odd one. If I open excel by the standard shortcut one instance opens and everything is fine. If I double click on an excel file (example myfilename.xlsx) or do a right click > Open, two instances of excel automatically opens. The first instance is just a blank excel page with no workbook which says Excel at the very top. The 2nd instance has the actual spreadsheet. While this does not stop me form using excel properly it is very annoying to have 2 sheets open and have to close both sheets when I am done.

Has anyone else seen this problem before?