This!! I ran into this bug as I tried to push past Far Cry 2's many other flaws and finish the damn thing... Suffice to say I never bothered to replay the entire game just to get past it. I'm glad Far Cry 3 doesn't seem as shoddy (so far!)
I would not hold your breath.
I decided to give FC3 a whirl after the great reviews and yes it is awesome in its scope but it is a bug riddled POS and there is a major bug about 20% of the way into the game which prevents me from continuing (cannot travel to Badtown). Going to ask for a refund (hah).
A real shame as it is the game that Crysis 3 should have been.
Mark of the Ninja now, that is a masterpiece in pretty much all respects (art, design, sound, gameplay).