I had a strange experience after updating to OS 4.2.2.
All my rigs sounded really harsh when I engaged the Green Scream.
I noticed this in Performance mode as I have a GS in pretty much every slot of 20 performances.
It was awful and it was happening on every rig in every performance.
I then decided to fix it and went into edit the GS in one of the slots.
I noticed that the tone was set at 10....not where I remember having it set at all!
So I turned the tone down to zero and the rig sounded just fine now...
here's the funny bit, EVERY rig now sounded OK and on further investigation I saw that the tone on every GS in every performance was now set to 5, and everything was back to normal....after just adjusting tone on one slot of one performance
I obviously can't reproduce this but if anyone has a similar problem, go and tweak the GS tone setting and it might fix your problem too.