Excel 2013 Autosave not working

I have an unusual problem with Excel autosave not functioning. I have Word and Powerpoint autosave working. I have setup Excel, Powerpoint and Word to use the same autosave settings and using the same path. Excel does not create the .xar file. The version of Excel is 2013. Any thoughts on what is happening?

What triggers Excel to autosave? I made a change to a blank workbook and waited for the allotted time and no .xar file created.

Respectfully,

Richard Blackmore