Affects Version/s: Minecraft 14w30b, Minecraft 14w30c
Fix Version/s: None
Environment:Windows 7 Home Basic x64
i7-3630qm @2.4GHz / nVidia GeForce GTX 660m (v335.23 WHQL Drivers) / 16GB RAM
Java Build 1.7.0_65-b20
What I expected to happen
Mobs should be moving around normally, and performing their default actions.
What actually happened
Instead, They keep jumping and spinning around themselves in the same place. Some monsters, like zombies and slimes won't try to chase and attack you. Spiders and tamed wolves will try to attack while jumping, spinning, moving slowly and randomly towards the target.
Steps to Reproduce
1. Find a place with some mobs
2. Observe their behavior.