I've replayed this mission at least 20 times. I've destroyed all the towers,3-8 convoys and killed the boss in the upper right part of the map. I've started the mission all the way over from the start, used saves and auto saves, I've reinstalled the game and verified game files. I get through the mission briefing but I can't continue past it. If I esc out it doesn't save I have to complete the level all over again and I still can't progress.