I went back to 3.22.74 and as some of the other threads about this have mentioned, I deleted all the actions in the Action Library - all my actions are still in their respective Profiles. That seems to have "fixed" the problem - but obviously they have some work to do on this.
To download previous versions of iCue check this post:
https://forum.corsair.com/forums/showpost.php?p=1024789&postcount=32):
downloads.corsair.com/Files/CUE/iCUESetup_{version}_release.msi
replacing {version} with the correct one you want to download - i.e. 3.22.74, 3.21.88, etc.
Official ICUE 3.21.88 Download