Almost any mod I install, Forge does not install nor recognize it, but in checking the logs, it sees that one is there! I have installed Buildcraft 3.15, Client A-Core all the way down through Client-C-silicon, but the problem is not exclusive to this mod, and is ANY mod, including railcraft_client_5.4.7b or industrialcraft. I've tried most anything I can think of, including downgrading Minecraft and using a 1.2.5 version of Forge, writing files directly to the JAR (I know I am not supposed to do it, but tried it, doesn't work) NOT installing Modloader, as well installing it, and many other ideas, none of which work.
I'm running out of Ideas. I've included the file ForgeModLoader-client-0.txt, not sure if that is what is needed or not (I've read the pre-requisite forum posting, not entirely sure of which log it means)