"I don't know what the France has gone wrong here". Means I don't know why this error is occurring. Sorry if you were confused. I'm still confused. The original low res render was using the Firefly renderer. I've experimented with doing a full render minus Raytracing, Casting Shadows, Texture Filtering etc... each in turn, but in every case, the "mystery nostrils" are still present. I can render using the P4 Renderer but it's not as sharp. I'll try it on Production and see if that does me any good. I have a number of ways to "work around it", however, I'm most interested in why it's actually happening in the first place. If anyone can shed any light, I'd be grateful. Thanks Chloe