The issue is two folder, 1) He edits a base class EnumArmorMaterial to add a new 'PLASTIC' material, if every mod did this they would al conflict, and quite often do. So he should REALLY move to forge so he can stop editing base classes.. he has no reason to u.u
And 2) He doesn't ship his base edit anyways, so it would of never worked.
We try and support all ModLoader mods, however as soon as the mod makes a base class edit they are on there own, as any mod that edits base classes pretty much defactor doesn't care about complaitibility.
So go talk to the ipod mod's maker tell him 1) his packaging is wrong and missing his base classes and 2) Move to forge so he can be base clean.