I'm running Minecraft 1.4.5, and I'm using FML version 6.4.0.394. I have tried using the Magic Launcher to install FML first and then my mods (Rei's Minimap v3.2_05, InvTweaks 1.45-1.4.4, and OptiFine 1.4.5 HD_D3) and I've also tried dragging the files from the FML zip filer into minecraft.jar and then running through the Magic Launcher, and nothing has worked. I haven't found much about 1.4.5 yet and I'm assuming not many people have switched.

This is the only error I get:

 

*** MagicMinecraftLauncher 1.0.0 ***

java.lang.SecurityException: Invalid signature file digest for Manifest main attributes

    at sun.security.util.SignatureFileVerifier.processImpl(Unknown Source)

    at sun.security.util.SignatureFileVerifier.process(Unknown Source)

    at java.util.jar.JarVerifier.processEntry(Unknown Source)

    at java.util.jar.JarVerifier.update(Unknown Source)

    at java.util.jar.JarFile.initializeVerifier(Unknown Source)

    at java.util.jar.JarFile.getInputStream(Unknown Source)

    at sun.misc.URLClassPath$JarLoader$2.getInputStream(Unknown Source)

    at magic.launcher.r.getInputStream(Unknown Source)

    at sun.misc.Resource.cachedInputStream(Unknown Source)

    at sun.misc.Resource.getByteBuffer(Unknown Source)

    at java.net.URLClassLoader.defineClass(Unknown Source)

    at java.net.URLClassLoader.access$100(Unknown Source)

    at java.net.URLClassLoader$1.run(Unknown Source)

    at java.net.URLClassLoader$1.run(Unknown Source)

    at java.security.AccessController.doPrivileged(Native Method)

    at java.net.URLClassLoader.findClass(Unknown Source)

    at java.lang.ClassLoader.loadClass(Unknown Source)

    at java.lang.ClassLoader.loadClass(Unknown Source)

    at magic.launcher.Launcher.main(Unknown Source)

 

 

Delete the META-INF that comes with forge and see how that works.

Tried it, still get an immediate black screen after Mojang pops up. I know it's not my graphics drivers because it was running fine before I updated to 1.4.5 and it runs fine without the mods.

New log after deleting META-INF?

might not mean much but was having similar issue, was about to post a fresh log when i decided to delete logs to make sure log was clean, minecraft started just fine...currently only have forge and buildcraft installed and now am waiting for update to IC2....

Okay fine. Try deleting the META-INF in minecraft.jar.

Magic Launcher will complain, ignore.