Unity 4.3 - Generic Animation not working

Hi, since the update to 4.3.0f4 or even 4.3.1f1 (from 4.2f) one of our Generic Rig characters is not playing animations correctly. If we revert Unity back to 4.2 the animation running correctly. At the moment it looks like the bones are affecting the the whole mesh instead of each seperate bone.

The Mesh is like a floating sphere, with only some bones for basic animations and for some moving tubes - so a humanoid rig is not needed, but generic is not working ...

Our workflow:

Mesh with RIG (.FBX)

• Rig: Generic

• Avatar Definition: Create from this Model

• root: Mesh_RIG/root

• Optimize Game Object: false

Animations (Motionbuilder) (.FBX)

• Rig: Create from Other Avatar

• Source: >>Avatar from above<<

Did anything change for the animation workflow for generic meshes in 4.3 ? Or what did we do wrong ? :)