Running game build 459 under linux. I can build a party, but when I set out on my first adventure, the loading screen gets to 79% and then hangs. The console prints 90 copies of the message: "Error in Graph:createEdge: edge already exists"

I've tried messing with various options, more-or-less at random, since I have no idea what that message actually means; none of them appear to change anything. Any thoughts on how I can get the game working?