Broken default models when previewing custom skins

[tillinghast]

when previewing skins that use custom human arthas texture (such as this, this and this), "arthas_portrait.mdx" and "arthaswithsword_portrait.mdx" appear broken and lacking camera
"jaina_portrait.mdx" is broken in the same way, geometry all over the place and no camera
could it be that it's pulling some broken model from the models repository instead of default one?

 

[tillinghast]

broken "herodemonhunter.mdx", it just won't load at all, but _portrait works
same with "illidanevil.mdx", it freezes on a frame from a model you were viewing previously but loads list of available animations
same with "lavaspawnmissile.mdx", "lordofflamemissile.mdx", "infernal.mdx", "infernalbirth.mdx"