So this is the original Modloader. http://www.minecraftforum.net/topic/75440-v132-risugamis-mods-preliminary-updates/ have you tried to save your maps, delete the whole .minecraft folder an redownload it. And well you did everything the right way... so theres nothing else i could say..
^ Just reminded me of a Reddit conversation I had earlier today on this subject: http://www.reddit.com/r/mylittlepon...would_you_choose_to_be_your/c6lmf9t?context=3 (I'm RRU4MLP)