It's not just Mac. It seems after the initial release for PC a lot of users were having the same, "puzzle 2" problem and it took Telltale over 6months to fix the bug. If anyone is curious here is a thread on telltale's site: https://www.telltalegames.com/community/discussion/17891/puzzle-agent-graphical-bug-on-puzzle-2-with-snowmobile/p1.
Current Mac OS is 10.11.2...so 10.8.3 was a while ago. Since I got the game via Steam sale, no refund, but I submitted a request to telltales to see if they have any suggestions for getting the game to run. I'd be OK to run an emulation -- but I'd rather not have to purchase a copy of windows to play a 2$ game.