This was happening in 16.04 but I was hoping that an upgrade to the latest everything would fix it. I installed tuxmath using "apt install" and it shows up in the Applications menu so I added it to my favorites and now have an icon in the bar. However when I click the icon the program starts to work then crashes just before the menu items appear. When I run from a command line the output is
libpng warning: Interlace handling should be turned on when using png_read_image
Segmentation fault (core dumped)
I find that if I run in windowed mode everything is fine, but I really need to modify the launcher for the kids. How do I add the -w to the command initiated by the icon in the launcher?