Hi,
I use SMath for some classes in the university, by video beam. When I tried to change the font size for easy viewing for students I found that although I changed the font size, the symbols remainded at original "10 pts heigth". I created a simple file to show this issue:

Observe that as you increase the font size, the relative position of the subscripts, superscripts and operators, changes dramatically to the point that at a size of 50 pts is difficult to clearly identify them.
Regards,
Oscar