Hi there. I'm running BTT v3.506 on a MacBook Pro 16" with Catalina 10.15.7
I've just found that when using my BTT Volume Slider and Brightness control touch bar widgets, the on-screen display setting for these is no longer working. However, the MacOS volume and brightness sliders DO show onscreen....so the problem seems to only affect the BTT volume/brightness widgets. This only seems to have stopped working today, probably after my efforts to get the BTT Auto-launch option working again (which had also stopped working today).
Interestingly, the onscreen display works when I press the BTT Mute button widget....just not the onscreen displays for volume/brightness.
Any advice on how to get these onscreen displays showing again?