I have the same problem, but only with new versions of FMM. While v.1.0.5.9 works just fine, any higher version simply fails to load. I get the error saying "An item with the same key has already been added". Isn't there anybody who can help with that? I'm not new to using mods... but I know little about programs. What could be so different between v.1.0.5.9 and v.1.0.6.2, for example? Any ideas?