Same problem as OP. Specifically trying to pick a name myself for the tribe (meaning: type one into a pop-up text box) stalls the game on clicking 'proceed' - this isn't a full freeze as the music keeps looping and the game's RAM requirement occasionally increases, though not up to memory leak levels.
For anyone having the same issue, choosing a name via divination worked fine and allowed me to proceed. So, not a completely game-breaking bug, but still a major nuisance for a game revolving on putting one's own stamp on the world.