Aw, man. The game was going so well until I picked up the golden relic on the rooftop. Then Lara completely stopped responding to all keyboard controls as she very gradually drifted down into where the relic's pedestal descended (but at a far slower rate), which was immediate after the relic was acquired. Even when she touched the ground down there, and even after I repeatedly clicked "Respawn" in the menu, she didn't respond to any keyboard controls, so I had to quit the game. It was fun while it lasted, though.