After upgrading to both the 18.2.3 and the 18.3.1 drivers I haven't been able to open Radeon Settings. After boot, I don't get the Radeon icon in the task tray, and if I have task manager open while I try to open Radeon Settings I see RadeonSettings.exe start and quickly die. I have tried the clean install option, the AMD driver cleaner, and DDU, all with the same results. I've needed to revert back to 17.2.2 to gain access to Radeon Settings. I have reported this on the "issue reporting forum" as well.
Gigabyte Aorus RX580 8GB
Windows 7 64 Bit
ASUS VH238H 1920x1080@60 DVI
ASUS VH238H 1920x1080@60 HDMI
ASUS VH238H 1920x1080@60 Active DP DVI adapter