Just in case it helps, I got a crash on Mac-x64 version when embarking on adventure mode using default world-gen except for switching world size to pocket. I tried again only with a world with a short history instead of medium and the same thing happened.
Fortress mode seems to work fine.
Sorry if you're already aware. Let me know if you want me to test anything or something.
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
full crash report:
https://pastebin.com/qRn7ghDu*** STARTING NEW GAME ***
Generating world using parameter set CREATE WORLD NOW = 1333333
Seed: bHCZyc2ODEHkMDrJAGx9
History Seed: x2ZNCvstre6RqRac3fqz
Name Seed: kmQfbg1rJAtlhSIaw6ef
Creature Seed: zm2zhk75MtvHET5BNTBP
*** STARTING NEW GAME ***
Generating world using parameter set CREATE WORLD NOW = 1233333
Seed: ozXLMBOVBeU4zPd2gOnf
History Seed: CMYOYoKDHJUVr8dOEKxk
Name Seed: rbJ0huNdHvsIzkSMeCiG
Creature Seed: Ki47U8vkBqM18YHjvXtM
*** STARTING NEW GAME ***
** Starting New Outpost **
Edit: Third time's the charm. Tried a third time with a small world with shortest possible history. This time was the first time it let me pick a race. The first two times I only had the option of human, and at least on the first one, the default starting location was a lair.