I'm a brand new user of Karabiner-Elements (long-time user of BTT, recent user of Rectange) and I find that after starting KE, BTT stops getting keystrokes, as well as the Rectangle app. Both start working again after stopping KE. Thus, it would seem to be a KE issue. For now my workaround is just to not use KE (not a loss to me, as I never got as far as configuring KE to do anything for me -- it just immediately impacted BTT and Rectangle so I quit KE)
As for my system, I have a 2019 16" Mac with Catalina 10.15.7, BTT version 3.401, KE version 13.0.0, Rectangle version 0.30
I'm a brand new user of Karabiner-Elements (long-time user of BTT, recent user of Rectange) and I find that after starting KE, BTT stops getting keystrokes, as well as the Rectangle app. Both start working again after stopping KE. Thus, it would seem to be a KE issue. For now my workaround is just to not use KE (not a loss to me, as I never got as far as configuring KE to do anything for me -- it just immediately impacted BTT and Rectangle so I quit KE)
As for my system, I have a 2019 16" Mac with Catalina 10.15.7, BTT version 3.401, KE version 13.0.0, Rectangle version 0.30