Feed the Beast

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Hello Forum

I have been using FTB Launcher for a while now and it wasnt till recently I have experience an error like this one.
I Recently updated my Launcher to the newest version. (v1.3.4) On both (4month)old and (2/13/14)new versions I am experiencing a **Critical Tampering with Minecraft error**, when FTB attempts to launch mod packs Direwolf and Horizons, but not mod packs such as Unleashed.

  • I have updated java to its newest version.
  • Removed and Deleted all folders of FTB (including the Roaming one)
  • Reinstalled FTB from scratch.
  • Copied folders from a friends working copy of FTB launcher.
  • Reinstalled Vanilla copy of Minecraft in .minecraft folder.
  • Force updated all installs on launch.

This is my Error report from one of my last tries using (java v7-45) http://pastebin.com/F2Jg1ygN and (Java v7-51) http://pastebin.com/aQtknQdJ

Lines .156-.158 include the Red text error ,and a problem of ClientBrandRetriever.class in the /FTB/versions/1.6.4/1.6.4.jar Also.

I am stumped to the cause to why and how this can be resolved.
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