Well, lovely news, the problem is indeed fixed! Your chnsetTest files from earlier work fine now. Hurrah!! That's great—there's a feature in the project I've been working on that hadn't been functional for a while due to this so I'm quite pleased.
So far I haven't noticed any obvious new problems except for one—I don't seem to be able to output sound via JACK from the Cabbage standalone application. It might be worth making a new thread for this, I guess. Basically, the only possible output I have is the PulseAudio sink (I use Cadence) and Cabbage doesn't seem to really run sound through it anyhow.
Before the update, I could output sound via JACK, although it would have a lot of pops and clicks.
Thanks so much for your hard work, though! Very glad the issue did indeed disappear with the new version of JUCE.