It seems the beta broke Karabiner completely. The program opens and runs, but doesn't actually modify any keys.

Re-entering configurations does not fix it, nor does messing around with permissions to my knowledge.

If you are doing only simple remapping, you can use Apple's built-in hidutil tool.

@chuyeow thank you so much for this info! Now I can set it and forget it 😃 ‎ (at least for the foreseeable future!)