Fri Mar 16, 2018 10:44 am
I have the same machine and tried High Sierra. Went back to Sierra and all problems went away.
Apple has a very immature system version there.
Now that the cat #19 is out of the bag, test it as much as you can and use the subforum.
Studio 18.6.6, MacOS 13.6.6, 2017 iMac, 32 GB, Radeon Pro 580
MacBook M1 Pro, 16 GPU cores, 32 GB RAM and iPhone 15 Pro
Speed Editor, UltraStudio Monitor 3G