so, its been a while since i dont use sfs 1.35 but i'll try to help you out. first, what mod did you install? not all mods are exactly compatible with the sfs, and i know by a fact that sometimes it even depends of the specs of the pc you're using (when i used sfs 1.35 on my old pc, some mods wouldnt run, so i assume its because of the computer's system or specs (CPU, RAM, memory, etc...)) so first check that. now, textures are another topic because there are actually several ways to install textures on sfs. theres a mod that lets you edit textures directly in-game and theres another technique that doesnt need mod loader at all, which consists of directly editing the game's files where all the data is. this is normally the best way to edit textures and the most reliable one. thought not the safest one, as if you dont save the original unedited file, you will need to reinstall the game. so thats first. what mod did you install?