I downloaded a shader mod and put it in my mods folder. When I started up my game it says that i needed MCEF. The MCEF files downloaded to my game but whenever I boot it up again it says Preparing MCEF and then the game closes. It doesnt even give a crash report.
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1286604-shaders-mod-updated-by-karyonix
EDIT: The more appropriate question would be if you have any other mods installed.