Extremely low resolution on mid-2015 Macbook Pro (El Capitan)

Player.log After starting the game, it's running at an extremely low resolution. So low that I can't make out the build number in the top left because it's illegible. It's something like 1.4(garbled). I'm running OS X 10.11.4 El Capitan on a Mid-2015 MBP, 2.8 GHz Intel Core i7, 16 GB RAM, AMD Radeon R9 M370X 2GB VRAM. I only have 2 options to choose from in the resolution settings. I can't quite make out what they are because it's garbled, but they seem to be sub-1000xsomething.