**System Information**
Window 8.1 on a gtx 660ti
**Blender Version**
Broken: Blender 2.75
Worked: Blender 2.74
**Short description of error**
I just found out that when i export my character rig using the FBX Export, it adds my Rig as a top level bone. This means if i have a Root bone in the rig, i now have two when i export. The reason this is a problem is because i have Root Motion embedded in the animation and when i import it into the Unreal 4, it can no longer grab the Root Motion from the rig. This is because Root Motion is read from the top level bone. It looks like an error in Blender 2.75 as it worked fine in 2.74 and i could find no way to avoid it. It just means I can't use Blender 2.75 until i sort through this problem. I hope this helps!
You can not replicate the problem by importing it back into Blender so i included two pictures of unreal 4 for convenience.
{F204227}
{F204223}
{F204224}
Ps I have attached a simple rig, but it does the same with any rig