Annoyingly this (4.3, haven't tried 4.3.1 yet) driver gets worse. Plugged in this morning and had the airplay workaround just going nuts. Wouldn't detect the display but would just keep the airplay button clicked and waiting. Couldn't close or anything, couldn't shut down properly. Had to give it the middle finger of justice on the power switch.
It's not like I needed any of my workflow open or anything
Any closer to fixing it on 10.13.6?