What's causing the colorful artifacts? I've been using Musgrave textures for years, but in 2.79, I am getting some ugly artifacts along the edges of the object. It doesn't happen in the preview render, only in the final render. Is anyone else getting this? It can easily be recreated by simply connecting a Musgrave texture straight into a diffuse shader and rendering with Cycles.
Just checked with my file and I can verify, it looks like the denoiser is the problem just check it off. Its weird. 





Its hard to tell with the 2nd picture but there is definitely some weird artifacts. (click image to view them better)

Its real bad with princpled shader