I did not see another topic covering this, atleast not recently. I cannot get shaders to work witth tekkit 1.2.9e at all. When I copy the shaders with or without optifine into the modpack.jar then try to run it, it acts like it will open, then just quits as if nothing happened. I chose the correct version of optifine and shaders for minecraft 1.6.4 (which is what tekkit runs) Please help!!