Yeah, I use Blender as well. You should look into using this in the future: https://.unrealengine/showthread.php?34619-ADDON-BLENDER-UE-Tools. It works marvelously. It may require that you redo some of your work but there’s some kind of crazy thing going on between Blender and UE4 as far as fbx goes. You can’t make a workable UE4 Mannequin rig and sometimes the bones get rotated in strange ways in the export. Both sides are working on it but in the meantime it’s a pain. Also, make sure you triple check your bone weights anyway. It’s easy to miss something.