petesbodyparts

Could it be the new 2017 iMac's with the Radeon Pro R580 video cards? I'm only seeing this issue since upgrading from an 2013 NVIDIA iMac to the 2017 model. Also with SMP 4.5 active. Also, if I then switch HDR back off, you still see SMP clouds, but there is also cloud 'ghosting' on the screen (not sure how to explain it - looks like very light-grey clouds like they are burnt into the screen) until you quit and restart.

Can confirm same here where the issue only appears in HDR OFF.