OK, Adrenaline 18.5.1 and Windows 10 April 2018 Update were no go for me.
They are just too buggy at this point.
I would recommend not to install either of them if you would like to run GGS.
Don't you think that it's not buggs in 18.4.1 and 18.5.1 drivers? Maybe AMD maded many changes in ADL? It's strange that both 18.4.1 and 18.5.1 have the same bugs... I think that all new drivers will be with the same bugs... Maybe it's need to change something in miners to normal work with new drivers?