My Game Breaking bug (it cuts a lot of the game if I want to bypass it) is weird, but it happend with New Vegas (and maybe Fallout 3 too).

Well, it came out today for Skyrim (and yes I was playing since about the release) and the bug just screwed everything up again...

In New Vegas, in Camp McCarran when Carrie Boyd talks with Silus, same thing happened...
The two NPC's are speaking with each other and, after a speech line (undefined as it can stop on any line), they just stop talking, both of them... And their characters are "busy" and I cannot continue...

In Skyrim, today, same thing happened... I was in Jorrvasker, when you go give back Aela her shield, either Skjor doesn't call Farkas, Aela doesn't finish her lines, or Farkas comes and stays there like a peon, busy too... I even tried ramming him, doesn't work)

I tried so many things (hardware)... Reloading, creating another game, disabling devices (hey, I'm desperate here). I even tried it on different OS and it still didn't fix it! (On 7 64 bit now by the way).

Well, unless someone has a brilliant idea, I give up!

Long shot, but try the mod "No NPC Greetings" and see what happens.

Also, have you loaded a save from before you start this stage of the quest, not while it is active, and tried it again?

Have it already!

I think that the problem is more hardware though... Well, let's say engine software / pc hardware conflict... I found only one post for New Vegas related to this... And how did it work for 3 months and now, doesn't work anymore... Makes no sense!

After some more tests (yeah, I had free time to waste today) it seems like a script lag or something... I mean, it happens but it can take some seconds for a scene to another and about 5 seconds to Vilkas (after Aela finishes her speech) for Skjor to call Farkas and 15 for Farkas to start walking... So, it's like, the quests are full laggy... A little better then my New Vegas problem but it's still very annoying!