I have recently run into ab export problem with my characters my old modes are in unity without probables how ever  I cant get my newest model into unity without her thumbs being twisted and out of place (see screen sot) 

to be clear on the steps I tike

3D exchange 7

1 click export

2 click the unity option

3 include animation

4 unchecked the one export pre animation box

in unity

5 set avatar to humanoid 

6 configure the scletin

7 move spine 1&2 down on the selection

8 apply 

I have know Idea why the tombs  are twisted now  even if I copy from an old avatar there still twisted?