Have you tried contacting Andy at Ultimarc? He usually has a few things that he'll ask you to rule out for starters. He probably won't get very in depth on it though, but he's good help at times. Also there are quite a few steps for properly setting up ArcadeVGA...I assume you set all of that up properly, otherwise it wouldnt have worked on your WG. I'd hit Andy up for starters and let him know you had it working properly on your WG, so youre apparently doing all of the setup correctly. He might know more about using it with a Nanao MS8. First thing hes gonna ask you is if you can see the Galaga icon on your lower right screen with all the different resolutions. Again, I'm pretty sure you already have that. Good luck man!