Thanks Frank!
Ok guys I think Material Previews are to be blamed for CUDA errors. I had them disabled after working on a project and they were off while I was working on that scene with animated lights. After turning them on I can now see the same CUDA error after frame 5! Apologies for that.
Could you please try disabling both of these two options in Live Viewer before opening the scene and see if that fixes anything?
UPDATE: In the meantime, this issue was fixed in the latest 4.00 XB3 released a few hours ago! No more CUDA errors with material previews on here! That's our Ahmet ladies and gentlemen! In retrospect, these are uncharted territories, we're breaking new ground here in terms of how C4DOctane can be used so some turbulence was to be expected along our flight I guess. (and I'm probably the king of bad puns)
Regards
Milan