Bukkit

What steps will reproduce the problem?
1. Start the server
2. Kill or hit a cow/pig/ or chicken
3. Nothing happens (They wont attack)

What is the expected output? What do you see instead?
The animals will float, attempting to attack me but won't.

What version of the product are you using?
Hostile Mobs 1.2

Do you have an error log of what happened?
No errors

Please provide any additional information below.
They float and try to attack but I take no damage.