I seriously doubt that the AI upgrades itself during a game, and only after a merc 'teleports' back to my character's side after getting stuck one too many times. The point I implied was that everything was going normally prior to this bug occuring. That is, monsters targeted my merc if he happend to be closer to them and/or seen by them before my character was. The ONLY times I have ever normally had a monster ignore the merc and go after me have been with the Ancients and certain act bosses.
I don't think merc deaths factor into the cause of this bug, because in some games my mercs never die, and the bug can still occur. It seems to be connected in some way to the instant 'teleport' they do whenever you get too far away and some internal timer expires, as was the case in 1.09d.
Oddly, I don't have this problem with summons, just hirelings.
The reanimated horde type monsters only ignore the merc if they see me first, which is often the case when the merc is lagging behind or getting stuck (again!), or if this bug occurs.
I don't think merc deaths factor into the cause of this bug, because in some games my mercs never die, and the bug can still occur. It seems to be connected in some way to the instant 'teleport' they do whenever you get too far away and some internal timer expires, as was the case in 1.09d.
Oddly, I don't have this problem with summons, just hirelings.
The reanimated horde type monsters only ignore the merc if they see me first, which is often the case when the merc is lagging behind or getting stuck (again!), or if this bug occurs.