I know why the crypt fiend isn't working. Its because you have TFT and in TFT they added the burrow ability to the model and must have got the path wrong and put the path units\undead\cryptfiend\cryptfiend.blp. 2 ways of fxing this import the skin twice with different paths or I can change the path for the TFT model to textures\cryptfiend.blp make a choice. Damn Blizzard Messing up the paths.
[edit] It also like this for the archer I beleive, I forget, It was one of the bow and arrow units.