I experienced a weird AAX bug earlier. Trying to activate an instrument track in Pro Tools with BFD3 on it, caused PT to hang (beachball). Even trying to insert BFD3 on a new track did the same thing. No plugin GUI on screen, just frozen.
Installing BFD3 again seemed to fix it, but that was very odd. Nothing new or changed on my setup. I’ve been using Standalone fine lately, but it had been a while since I ran it in Pro Tools.
Build 3.4.4.31
LM 3.0.6.22
macOS 10.14.6
Pro Tools 2021.6
Mac Pro 5,1