+1 (Macbook Air Mid 2013 with Yosemite 10.10.2)
The game crashed only occasionally before, but now (8 hrs in) I can't save anywhere without a crash.
Happens everywhere, not just in Raedrics Keep. Just got access to the Stronghold, maybe this changes the savegames somehow?
Apart from that - great game, Obsidian! Can't wait to gather my party and venture forth...