Just like to say I'm having the exact same problem. I was playing through consecutive levels, and got to Exodus, and played it about 3 times (it's hard!) and then gave up, and shut off fs2_open. Upon restarting it, and picking up where I left off, the problem occurs. Is it because it uses information from the previous mission somehow that got lost during the restart? It is strange thoguh that everything appears to be jsut fine for a few seconds, before it crashes to the desktop. I did try a "replay last mission" and then move on to the next, and it still crashes. Odd that it worked several times before, so long as I didn't close the game....