Repro:
1. Select two models that can correctly map to an avatar
2. To to rig importer and select Humanoid animation type / create from model
3. Apply

Notice:
- the models did not get set up correctly, but they can be mapped manually or auto-mapped individually without problems
- exceptions in console about serialization, more exceptions when avatar editor is opened to configure the avatar

RC5/mecanim-4.0