Shaders problem Please help! :(

My Minecraft shaders worked fine a few hours ago now I turned Minecraft on and when I use any of the 10.1 seus shaderpacks it says shaders initialized the screen just goes black. I have good gaming pc on which minecraft with ultra shaders used to run at more less 30 fps so that's not the problem. I really tried almost everything could you guys please help me?
If you need any more details tell me and I'll reply
Thanks