A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
This didn't work but put me on the track to discover a solution at last. It's the personal macro workbook in the XLSTART folder. Without it Excel only opens just the one session so, solution is to copy it somewhere else rename it, delete it in the XLSTART folder, open Excel, record a short macro to save in personal workbook thereby generating a new PERSONAL.XLSB file, then open the old renamed PERSONALtmp.XLSB file and copy your code into the new one. Da da (for me anyway). Hope it works for everyone else.