Root bone is steady in iClone and in Blender as well. You may not see Root Bone (Motion Root) in iClone, but it is editable in Curve editor (it is a premium plug-in).



Thought I do not know first thing about UE, this is how it looks in Blender:




Maybe someone who working with Live Link \ UE Export would shed the light to the problem you are having.

Thank you so much 4u2ges. I'm very happy to see you have a solid result and that it is possible to do. Thing is, I do have that option checked. Are there any other important settings you can think of that I might be missing? I have tried all of the other options in that menu, still to no avail.

Also, can you tell me what the root bone looks like in your successful export test? Is it straight vertical with movement keys on the horizontal? Or is the base of the root bone locked to 0,0,0 and the tip locked to hip movement? I am wondering if somehow the "Reset Motion Root" switch on the FBX advanced export is not working (always exporting as ON?) Because it is doing what the manual says that switch does "Set the root node to follow the hip instead of staying in place at the origin" no matter if I have it unchecked or checked. Just tried with a fresh project to see if it was a bugged file, but it is still exporting incorrectly.

Make sure Bake Constraint Key is checked while exporting.



Difference with and without Bake checked...

Hi, I have locked the position of my character's feet with a reach effector in IClone, and in IClone, the feet are locked in position 100%. But, when I export an FBX, the feet float around and I can see that the root bone is animated. It appears that Iclone is forcing the root bone to be straight vertical, and then animating the root bone's horizontal position to accommodate hip movement, while animating the foot bones to compensate. The result of this method is jittery/floating foot movements in the FBX. Is there another method for exporting? Other animation packages do not force the root bone to be straight vertical, allowing it to move in all directions while its root is locked to 0,0,0. 

Link to video of issue
I have tried 'Reset Pivot' on my motion clip and tried setting 'Reset Motion Root' to on and off in the FBX export advanced settings, all with the same result.