They've been working on it for a few weeks. It's a particularly resistant bug. I expect them to fix it soon though.
Yep, unfortunately we have a lingering issue with certain Mac hardware setups that we have been trying to solve for weeks. Mostly it's black screen/crashes at commander's tent, Lost Chapel, Gwerm's mansion and a couple of other locations. A whole dedicated team is busy with it for a while now, but there's no consistent solution yet, and some Mac users still suffer.
Truly sorry that it takes so long, you can be sure we're doing all we can there. It's indeed particularly resistant :(