MakeHuman - Blender - Mecanim, rotation problem


I have a problem with the workflow mentioned in the title. I’m using the male1591 proxy. When exporting the fbx from blender I choose -Z forward and Y up. When configuring the avatar everything seems to be fine. T-Pose and automapping works like a charm. When I then change to muscles tab, the character is turned on its back. Same of course happens ingame. Character stands on its feet, pressing play the animation works perfect, but it is laying on its back. Here 2 pictures:

Okay, I finally could solve the problem. I had to add a root bone, which is rotated to lay flat on the ground inbetween the feet and is parent of the hips bone.