This is currently happening to me, on mission 'Shadow' I have LCPDFR installed and it was working fine, however when i installed ELS the game wouldn't open. I have re-installed my game 3times since so i don't get why it isn't working? All my settings and level has been saved. Im happy to start form mission 1 again if it fixes the problem but i though that re-installing the game would already make me start from level 1!?!