A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
FOR THOSE WHO NEED TO KEEP YOUR OLD MACROS ### So, deleting PERSONAL.XLSB is not an option.
I solved this problem exporting all my Macros from Excel, in my case I just copied and pasted it into Notepad++ using the Visual Basic from Developer Toolbar, closed Excel, than I moved (or delete if you want) my old PERSONAL.XLSB from "%appdata%\Microsoft\Excel\XLSTART", opened Excel again, created a new Macro so the file PERSONAL.XLSB was created again... And using Visual Basic again, pasted all my Macros back, closed Excel.
Had to re-configure my shortcuts but more importantly, no more a second copy of Excel being opened.