I faced such an amazing problem in office word.
I have a file with lots of Equations, in which all the “, ” Character shown as ? marks automatically.
The point is that when I copy them to somewhere else its seems OK and it is shown “comma” as well.
And amazing part is when I open a new blank default word template it seems everything OK and no problem in equation, but when I open that file again, the “, ” in all document’s equations will change automatically o nonsense character.
Look this picture below :
I’ll appreciate any help.