[libreoffice-users] Math Symbols get corrupted

I have been using Libreoffice 5.1 under Windows and had no problem with 
Math symbols before.

But today, after installing and uninstalling a few programs, Libreoffice 
suddenly started displyaing some symbols in a wrong way.

This is a screenshot of what I'm talking about: 
http://www.robertoinzerillo.com/temp/math_01.jpg
The "vector" symbol over the letter "A" is being rendered as a series of 
squares :-(
This is not the only symbols which has been corrupted.

I already followed a few hints found in the internet, such like 
downloading and installing opens___.ttf file again; but had no luck :-(

Any suggestions?

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