This is not a bug, it is a feature recently added in Minecraft 1.6. It only effects creative mode because it was very hard to kill mobs/animals in creative without destroying blocks.
This is because you are playing on a multiplayer server. The server does not stop when you press escape. Only in singleplayer does the arrow stop when you escape.
conkey122
MC-2111
This happened to me while typing in /gamerule then pressing TAB while on my multiplayer server.
This is on all mobs, including cows, pigs, zombie pigmen. It's the shadow that shows up below them is getting tiled.
Confirmed bug in snapshot 13w24a
The two pictures I added are from my SMP server. I've restarted the server twice
I think it has to do with the TextureEnder.jar when you separate the files
This is not a bug, it is a feature recently added in Minecraft 1.6. It only effects creative mode because it was very hard to kill mobs/animals in creative without destroying blocks.
This is because you are playing on a multiplayer server. The server does not stop when you press escape. Only in singleplayer does the arrow stop when you escape.
Unable to reproduce. I have tested this in singleplayer, multiplayer, creative and survival.
Here are the controls I am using, I believe the problem is that you don't have L Shift set as your control.
The same thing happened to me. I don't quite understand why it's happening...