the game didn't crash.. cyrex is someone like an intel, always talking about something at the beginning of every mission. actually, he's at the base, mothership, or whatever. so, how can i keep him alive? also, his death was natural.. his protege showed up instead. talking and talking too. hehehe... about the light barge, i've already protected it. the objective has dissapeared.. here is the storyline.. after the light barge finished deploying mines, a scene occur. it involved cyrex's protege telling me about cyrex's death. then, bla bla bla, mission started again. but, only after a few seconds, i got that mission failed, your ally has died..