After a few minutes of playing, after a death I respawn to a black screen. Can still see and move my character but the map hasn't rendered. This occurs after exiting and restarting the game. Any ideas on how to solve it?

MacBook Pro (Retina, 13-inch, Late 2013, Intel Iris 1536 MB)

I've got the same problem :(
MacBook Pro (non - retina, 15-inch, mid 2012), OS X El Capitan 10.11.3

Same here, MacBook Pro (Retina, 13-inch, Late 2013), 10.11.4.

It works again if I exit the room, then re-enter.

Unfortunately for me it's introduced other problems. I crash when warping or going up an elevator. (But I can go down without crashing for some reason?)