This sounds like what I have been seeing. Periodic green-ish glitches that generally only briefly occur when a window or menu is being opened. linux-headers-4.10.0-27-generic seems to have introduced the problem as far as I can tell. Running with linux-headers-4.8.0-58-generic works just fine.
I'm running 16.04.2 with an RX480 with amdgpu-pro 17.10.
Thank you for your answer.
I believe that you just hit the right spot.
Let's see how the next upgrades go.