I just bought Portal 2 for mac, and everytime I press play, it always crashes: "portal2_osx quit unexpectedly." This is the generated report by OS X: "Process: portal2_osx  Path: /Users/USER/Library/Application Support/Steam/*/portal2_osx Identifier: portal2_osx Version: ??? Code Type: X86 (Native) Parent Process: steam  Responsible: bash  User ID: 501 Date/Time: 2013-12-29 15:40:18.285 +0000 OS Version: Mac OS X 10.9.1 (13B3116) Report Version: 11 Anonymous UUID: 8C0305BA-61DF-EFA8-1545-FF2B5447624E Sleep/Wake UUID: A7B2CC77-68CF-4323-9D94-7941426751D6 Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BAD_ACCESS (SIGBUS) Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000" It does it with both graphic cards : Iris pro and Nvidia 750M. I'm using a late 2013 retina macbook pro 15", model ME294 (2.3Ghz, Nvidia 750M, 16 Gb RAM, 512 Gb SSD). Anyone is getting the same crash? Thanks in advance.