Ubuntu 18.04, Libreoffice 6.0.7.3, Texmaths 0.48
The extension works when I choose Image format as png, but not as svg. SVG gives a blank image.
I am using the same extension on another system with Linux Mint without such problems.
TexMaths says the best way to get help with its software is by visiting http://sourceforge.net/tracker/?func=add&group_id=603713&atid=2444834.