During 1.6.1 (when the MCL did not automatically close), there was a few lines that said something like: "(Server) (Critical) GL ERROR" for about five lines, and some rendering error. Then, when the game started, and I pressed the maximize button on my second monitor, my computer froze and crashes, coming to a Mac screen that says "Your computer has shut down because of a critical system error...".

What I expected to happen was...:
I expected my game to become maximized and playable.

What actually happened was...:
My computer shuts down, then goes to a Mac system error screen, and reboots.

Steps to Reproduce:
1. Connect a monitor to a Mac.
2. Launch MCL.
3. Wait for the updating to finish, then press play.
4. Wait for the main screen of MC (where you can press play), then press the maximize button in the top right (Note: I mean maximize, NOT full screen.)
5. Mac will freeze, then shut down, going to a Mac error screen.

P.S. I have tried disconnecting my monitor and starting MCL/MC up without it, and MC starts up fine, and I can play it maximized. Also, I can play MC normally as long as I do not maximize the game.