The problem is still occurring in 1.5.2
That is correct. (I apologize for the late response.)
Still happening in 1.5.1 – Added screen shot.
1.5.1 Update does not fix this. Still mainly baby mobs.
I'm also very chatty from time to time so I probably type responses and chat with multiple players more than your average bear.
Vanilla. I like to run the latest version right when it comes out! 😉 No time to wait for Bukkit!
Confirmed happening mainly with "baby mobs." Adults are out mainly because they were babies that have "grown."
Confirmed happens when leaving an area and then returning. That is to say, leaving the allotted distance within the game that the mobs are no longer active and returning. (essentially the same as disconnecting and reconnecting.)
Confirmed happens when breeding, disconnecting and reconnecting.
It doesn't matter what type of farm mob it is.
I've got sheep, cows, chiduckens and pigs all in separate pens (wooden fence.) One mob of each is stuck in the NW corner and only the NW corner. If you attempt to lure or breed with respective food--they cannot be lured and the other mob must come to them for the breeding to work. If you punch or attack the mob with a tool or weapon, it will not move or run.
Weird that they haven't bothered to comment on this. What is this the gazillionth post regarding animals not working right? And it is as Daniel King says: More than just an animal problem. Ever since the game was made to use individual textures... "sumthin ain't right." Ever tried to press a button while sitting in a cart? Good luck. For now, I'm ignoring survival until it's not glitchy with all the Mob. I don't know. It just seems like this is the biggest bug out there and no one at Mojang can be bothered to even comment. I guess horses are more important... even if they die right away upon their introduction into the game.
Oh I can't wait until 1.6 is released. It will be so much better with dying horses.