Help save with a single mission to blow up a gun? (Generation Zero)

The mission where the truck is going to blow up the gun. All free to play - during the mission the truck would just stop and not go - after the installation of the armor, before the checkpoints when the tires are changed, the job does not appear to speak to the driver impossible. Only helps to exit the game, log back on, then if the mission starts over again to continue. Until the completion of the pass still does not work.

Tried license, pirates different Repack, with trainers without trainers... got already. Share the save game already completed this mission? If you can not further advance the plot.