I didn' find any trhead about bugs in 10.12.4 beta 1. I installed it on my MacBook Pro 13" mid 2014 and experiencing this bugs: 1) Every morning for about 30-60 minuts I see kernel_task process that causing that my mouse pointer is snatchy. I never experienced it before. 2) There is problem with gestures in Safari. I almost can't do back/forward gesture on touchpad or magic mouse. Reboot solved this problem! Can someone confirm this?