just played with the newest plugin version:
OctaneRender_for_3ds_Max_3.0_-_3.12
IES target mode does some strange things. sometimes it mirrors the direction in Y axes. can't really describe. see my very basic scene and play around with the target.
and very ANNOYING: the render updates only if I turn on/off the light. RELOAD BUTTON in OCTANE VIEWPORT does not update the light direction.
scene is max2015.