Try doing hard reinstall [Run uninstaller, Delete entire Feralheart Folder, then reinstall] BUT before doing that make sure to make a Backup folder of all your Presets/Maps/Etc in a different folder [NOT in your Feralheart folder]
Make sure you are putting the markings in Media > Textures > Markings. Select them all using Shift and scrolling all the way down to the last marking then clicking, then click "extract to" C:\FeralHeart\media\textures\markings [with WinRAR]
Double check if you put the markings.cfg in your main Feralheart folder. The list should be very very long when it is opened.