When attempting initial descent from Old Tower to platform in referenced mission, game crashes. While other sources have alluded to possible graphics card / driver issues, I believe in fact this instead may be a loading zone issue. Observations are below. 1) There are comparable jumps / falls elsewhere in the game I can complete without crashing the game. 2) I can in fact complete the descent with a straight fall, and the game crashes 0.5 - 2.6 seconds after impact. Either in the middle of bounce after impact, or after landing from the bounce. 3) If dying from impact or rocket launcher right before impact, game does not crash. I in fact have solid camera view around point of death. 4) In the event of number (3) on respawn I do not respawn on the lower landing at point of death. I instead respawn on the ledge at the Old Tower. This would seem to indicate that zone loading of the next area is not occurring successfully.