Smooth

I've updated to 3.21.88 and stayed there since that was finally a build that didn't have severe issues to a point where it shouldn't have been released to begin with. If anybody wishes to download that version, here is the link: https://downloads.corsair.com/Files/CUE/iCUESetup_3.21.88_release.msi

Hmm, it does for me. it could be a difference between home and Pro. Maybe check into changing your UAC on your PC for your account. Well, I guess you can check if it solves your problem or not.

It may sound silly, but have you set iCUE to run as admin upon startup? I had this issue randomly before and it mostly happened upon shutdown. Running the program as administrator by default upon startup made the error disappear.