I really don't like the changes to the IGLA and Stinger at all. A pilot with Stealth and IR Flares is pretty much invincible. if you manage to sucker him into dropping his flares then locking on again you might get a hit if he's close enough otherwise his flares will be back by the time the missile is in the air. Then he just flies away and regenerates without any drama. Unless you have 3-4 people running the AA missiles you may as well have a pop gun!
Can't say I noticed much change in the mobile AA though?
I have to say though, Extinguisher on the helicopters is fabulous! A pilot with extinguisher and maintenance and come careful flying along with a decent gunner with some good unlocks can stay aloft for ages.
As for the new patch, I can sometimes spawn with my weapon facing straight up or straight down? Only happened since the patch bu doesn;t happen every time either. Other than that no real moments but I still get my first launch 'BF3.exe has stopped responding' then it launches fine and I stay on without any major drama.
Something that has been happening to me also regarding bf3.exe crashing... need to level up my Engineer to make use of those "perks" as Im a pretty good chopper pilot but crappy jet one! lol