Game crashes and reboots Mac on starting up

[piersb]

Steps to reproduce:

 

- Go to Steam

- Choose Pillars of Eternity

- Click Play

 

Expected result: I get to play the game

Actual result: My computer crashes and reboots

 

I can't upload Player.log, because it's an empty file.

 

I'm on a 27-inch Late 2012 iMac running macOS 10.13.4. 

2.9 GHz Intel Core i5

24 GB 1600 MHz DDR3

NVIDIA GeForce GTX 660M 512 MB

 

I've played 39 hours of PoE on this machine, and it was working fine the last time I played it back in March 2017. When I try to upload the save game file, the forum tells me that I'm not allowed to upload that kind of file, so I'm not quite sure how to get that to you.

 

I can play the game fine via Steam on a new MacBook Pro; it's only this machine it's crashing on.

 

I've verified the files, then uninstalled and reinstalled the game via the Steam app, and the problem still hasn't resolved itself.

 

Any thoughts welcomed.