I'm using the latest stable version of the rhino 5 plugin in combination with Rhino 5 (64) with Nvidia 940mx graphics.
It has definitely worked in the past it just suddenly stopped.
I've tried everything mentioned earlier in this thread including deleting that file from my roaming, I've tried plugging it back to my screen to see if that was the problem. I've tried removing everything to do with octane and reinstalling it along with all the obvious stuff like restarting my rhino etc.
I'm still rather new to Octane and learning as I go so there is the possibility that I've missed a setting somewhere but for the life of me I can't find anything that solves the problem.