When you downloaded the Mass Markings did you copy and paste them all into your textures folder? In the Feral Heart folder click the Media folder and then find the Textures to paste them into. If you were unsure of where that was. Once you do that, be sure to click 'replace' and that is settled. Also, don't forget to take the markings.cfg file and paste it into the main Feral Heart folder, replace that one as well. I hoped this helped.~