Same problem please update and fix this thanks!
Yes I concur, and also no animations work at all. I was able to manually assign the bones and convert my FBX animation to a non-standard character, but not only do the animation previews not work but the animation that I imported in with the FBX file no longer work. I did notice that 3dXchange set the timeline to 1 frame after the conversion and my animation is 86 frames.