BTW, same experience in Jedi Outcast multiplayer at 1360 x 768. Crash to desktop immediately after completion of level load, if starting in 1360 x 768. But if I load the level at 1024x768 and then run the sequence of r_mode, r_customheight 768, r_customwidth 1360, and vid_restart, it loads fine, and then crashes when a new level loads.
Never give in--never, never, never, never, in nothing great or small, large or petty, never give in except to convictions of honour and good sense. Never yield to force; never yield to the apparently overwhelming might of the enemy.
Winston Churchill, 1941.