I'm not sure if there's a trick to making them work consistently but the xform handles I'm using to drive some internal transform sops aren't available most of the time in unreal. Sometimes, I select the HDA actor and the little grey/pink boxes are there. Sometimes (well, most of the time) they are not. Transform handles work perfectly in Houdini. And I'm unsure of the voodoo that makes them show up in Unreal. Is there a trick that I'm not aware of to toggle between object transform and xform handles?