@Andreas_Hegenberg A group of key sequences are no longer working. The structure is always the same. They used to work fine; I don't know what I could do or change.
have you tried the key sequence visualizer? (if you record a quick video of it I can probably tell what wrong)
I think what's shown here suggests that something was triggered. But unfortunately, that's not the case.
Ah, I found the problem. When I disable the preset at the bottom, everything works normally.
But I don't understand it. The preset briefly disables the arrow key if Shift was pressed before. By the way, you did it for me 
shift-arrow1.bttpreset (6.9 KB)
what kind of actions do the problematic key sequences trigger? is it maybe a problem with the action somehow relying on the arrow key?
Man, this is a total mess.
BTT crashes every time I press Left Shift + R. But not with Right Shift + R
I probably assigned a KS twice. Or something else. However, two identical KS shouldn't cause a crash. There's no conflict menu; instead, BTT triggers one of them more or less randomly... if I remember correctly.
Sorry, I don’t remember how to access the crash log anymore?
sounds like something triggering infinitely (one action sequence causing another trigger to execute that them executes an action sequemce that triggers a trigger again)
Crashlogs are in the macOS console app's user reports / crash log section
