The problem is with the neck and the head. The bend parameter is way off on both. If you do a search on bvh in this forum, you will get a host of messages on this subject. Sometimes, they talk about the neck and sometimes about the shoulders. You can correct the problem using the graph editor on the selected part. You choose the parameter that you want to work with in the graph editor. You adjust the first frame to the values that you want to work with. Then you click and drag to select the range of frames. The range turns gray. You then hold down the control key. This gives you double vertical arrows, You can then adjust the entire range. You have to do that with both the neck and head and maybe the upper neck if it has one. Usually, you have to adjust the resulting animation of the head and neck to get the movement you want as opposed to the movement that should have come across in the bvh file. The hands being screwed up is normal since there usually isn't matching joint data. There is also a problem with the Poser body parts being named differently from the standard names used in the bvh files.