Keep in mind that everytime i have tried this i have reverted the mission, so that doesn't seem to help

Another update: I tried again today just for good measure, and it worked! Apparently the vehicles didn't drive all the way to the Warehouse like they were supposed to, and it messed the ai up. Today they did, and everything went smooth. I didn't change anything With the settings, so i have no idea what caused the drivers to act so weird.

Update: It's not always the same reason for the vehicles splitting up, but no matter what it always ends up like that. Sometimes the vehicles get stuck and sometimes they crash into each other, or some of the soldiers are just late mounting the vehicles. I am always one of the first to enter the vehicle, just to see if it affects the splitting up, does that change the way the AI acts somehow?

I have already tried restarting the mission 4 times, same thing happens every time.

I have Windows 8, playing on regular, no other tweaking With the settings. Me and a team leader left, and i can't enter the boat. He enters one of them, i can't enter any of them. No teamkills during mission.

Right before we are told to get in the boats, you and Your team fight your way through the valley while taking mortarfire. When this part of the mission starts, i am no longer able to sprint, does this have something to do with the boat?

It worked after i reverted the mission

I had this problem too just revert the mission and it will work.