Yeah, all my files are either "Patch-1.MPQ" or "Patch-Z.MPQ"(I'm using one MPQ at once, switching them if i want a different race swap), I'm currently running WoW Repair, it may just be that coincidentally something got ****ed up in my wow(or pc :s) just when I was trying to use those model editing tools.
Never had a problem like that, currently I'm having the same problem no matter if i use model changing .MPQs+ MEF or if i'm running a "clean" version of wow