Unity 5.6.0: Mesh only rotates if I rotate the root bone of the skinned mesh renderer

Hey there, First of all, I'm a german so please forgive me my (maybe bad) English.

I'm programming a 2.5d Puzzle Jump'n'Run like Trine and of course, you can play an archer/ranger/etc. And you shoot an arrow by clicking on the screen and the archer will rotate $$anonymous$$s upper body, $$anonymous$$s arms with the bow and the head so that the bow is looking at the Point where you clicked on the screen.

I know that I must write the rotation in the LateUpdate function, to override the animation changes, however, the mesh only rotates when I rotate the root bone of the skinned mesh renderer.

In the Scene view the rotation is working fine, also by rotating the c$$anonymous$$ld bones, but if I start the game and pause it the rotation is not working.