on fbx export my model gets destroyed -> see image. why and howto resolve issue? After some minor changes on the model all of a sudden the mesh of the main body is copletely destroyed. The only things I changed were, that I connected two seperated parts of the mesh (with alt+M) and a bit of material, texture and UV changes.

Has anybody experienced this before? what could be the reason? 
all vertecies seem to still exist... the connections inbetween then is completely wrong tho.
This answer is valid for FBX 6.1 ASCII.

You have non ASCII characters in shapekey names, which the fbx format apparently doesn't support.



As it seems, two characters can't even be displayed in my Blender.

Rename these shapekey names with ASCII characters only.
You also have some missing weights on Body.


Exporting in FBX 6.1 ASCII works correctly.