The only thing i can think to do is, if your playing on a world that is yours, backup the world, and then reinstall the game version of 1.6.4 or try installing optifine.
IGN: FiveDegrees_ Discord: Scratatah#1342 Europe? (Y/N): N What do you enjoy doing most in mc? (exploring, fightning, building): Exploring/Building What is your building style?: Midieval/ Cozy( wood cabins etc etc..)
Yeah ill try it, the only things i dont like about most shaders is the amount of darkness in a building idk if you will have a setting for that but if you do <3
Go to my youtube channel and check out my youtube banner let me know if its nice if so ill make you a banner it depends on your taste www.youtube.com/user/stoneandjaketube
I would first try deleting all your minecraft files then re-install is if that dosn't help try getting in contact with the mod developer hope this helps!