I'm having a problem whenever I download Forge Universal for 1.4.6... Either manually or with Magic Launcher. Minecraft starts, the Forgeloader seems to work, the Mojang symbol appears and then poof 2 seconds later it black-screens and sits there doing nothing.
Also, I have researched this quite well and found about 20 other people with the same problem, a black-screen without any mods on a fresh .jar file..
Here's the list...