I'm seeing some CPU issues with 3.19 as well.
I use the Balanced power plan in Windows, and when I installed iCUE 3.19, HWiNFO64 showed my CPU clocks were always at 4.4GHz, even when idle with no programs open in the foreground.
When I exit iCUE from the system tray, the CPU cores would downclock back to 800MHz.
I reinstalled iCUE 3.18.77 and am not seeing this issue anymore.
What gives, Corsair?