I don't think the 1.05 patch is released yet, but is in beta. Thankfully, Obsidian is aware of this issue (see their note in the above conversation) and 1.05 is reported to have significant changes to the save/load system, so I would be surprised if this wasn't addressed there. I'm using the GOG version, so I can't speak first hand about the beta. I hope we'll know for sure soon! In the meantime, moving the graphics quality slider all the way down (left) has completely worked-around this issue for me. I've been able to play without a single crash by doing that on my late-2013 MacBook Pro (13" Retina).
For anyone who hasn't seen them yet...
1.05 beta patch notes (they mention that a lot of fixes are not listed in the notes, however...):
http://forums.obsidian.net/blog/7/entry-183-patch-notes-105-in-progress/
Beta patch announcement (where the save/load changes are mentioned):
https://forums.obsidian.net/topic/78824-105-patch-beta-live-on-steam/