Played the game three times for most endings, minor problems but got through them. Wanted to do it again for different ending . That when the I noticed the bug. Vehicle take down is locked. It requiers: Complete in 1x Kylrati Films: Racing quest. I have played some idid in previose playes defore, I think i've played some i never played before and still the skill Vehicle takedown is still locked. I called tech support they told me to uninstall game, reboot xbox and reinstall everything. I did, waitted almost all day. The prblem still persist.....
my mistake i just did one i had never done and it unloked. Although it would be unplesent for anyone with the same proplem as me who in there first time around did all racing missions. once your name is on the leaderboards the missions dont count as new.
DELETE ALL SAVE FILES and clear the race in one try. The bug is that even if you start a new game it still saves the replayable quests and it thinks your just replaying it. After you clear it the first time leave the race, If you find a race that you are positive you haven't clear it will unlock the skill if you clear it and leave. The game also saves the arena stats if you start a new game so you might lose the signature weapon on the second playthrough.
http://forums.ubi.com/showthread.php...1#post10414137