I think your problem is OptiFine. To get it to work for me I have to use the Complex 1.6.2 method.
B. Complex
(not working for Forge #780 and #781)
- Use the
official launcher to download and start once Minecraft 1.6.2.
- Use the
Forge installer to install Forge
- Go to the minecraft base folder (the official launchers shows it when you click "Edit Profile" as "Game Directory")
- Go in subfolder "Versions"
- Go in subfolder "Forge9.10.X.Y"
- Copy the files from the OptiFine ZIP file to "Forge9.10.X.Y.jar" as usual (you can use the 1.5.2 instructions for this) and remove the META-INF folder from "Forge9.10.X.Y.jar".
- Start the official launcher
- Select profile "Forge"
- Click "Edit Profile"
- Select the checkbox "JVM Arguments" and in the field next to it add
"-Dfml.ignoreInvalidMinecraftCertificates=true -Dfml.ignorePatchDiscrepancies=true"
- Click "Save Profile"
- Click "Play" or "Login" to start the game. If only "Play Offline" is available, then log out and log in again to fix it.