Hm...
There is some problem with the file though - I textured it with GMLTexturizer plugin and Kerkythea for instance cannot find any of the textures.
What I guess, GML Texturizer creates new textures from the old ones (not sure about this though) and when I deleted some of the (seemingly) unnecessary textures to purge the model (before posting it here), I seem to incidentally delete the needed ones, too.
I may try to redo the whole thing to see what's up.
Also, since GML Texturizer positions and distorts the texture, Kerky may not be able to handle it (I read some posts by Tomasz regarding this kind of issues though mainly with photomatch - and I don't know ruby at all anyway so I'm not sure this would be the case here, too).