IMO tigdebug flag should be recommended as part of any beta. You can catch all sorts of bugs with that. I doubt it caused the crash itself, more likely that whatever crashed the game went into some sort of infinite loop.
Sorry for not following up. I did not save the debug file before starting the game again, so it was overwritten. It was that big, though. Very odd. And maybe it's a distinction without a difference but the game froze; it didn't crash to desktop. I ended it with task manager. I reloaded an earlier save, did Luxwood again and I probably visited Teem's estate or the Rivermist Inn before heading back to PC. Now I'm contemplating how to address the end-boss of the pirate quest. So far the best I've done is to have two characters survive, so I'm going to give it another shot.