User blog comment:Ireithien/You Need To Click On This Blog Post. Seriously, Do It. For Me. :3/@comment-11274561-20130626193807/@comment-4052371-20130626200949

Force update and you'll get vanilla Minecraft working again. It will delete Forge and Modloader though, and none of your mods will work unless you reinstall Forge or Modloader (whichever you have).