The Unreal Engine 4.27 with leaderboard patch caused the game to crash on nVidia 3xxx and 4xxx cards. I have reverted to the July 2023 patch, which was the last to use Unreal 4.22. I will try to bring over fixes other than the leaderboard, which only works with 4.27. I am not happy to loose the leaderboard, but the silver-lining is that the clouds and lighting actually looked better on 4.22, and the game ran a bit faster.