Bukkit isn't fully completed for 1.6.2 quite yet. They are still developing the code and fixing bugs and stuff (this, for example), so it's going to have bugs.
Trust me. I've used Bukkit dev builds before, and have paid the price once or twice.
My suggestion is: Stay in the most recent Recommended build (which is currently 1.5.2), and wait for a Beta build, at least (they are usually less buggy, but still not complete).
There is a bug where sometimes the game doesn't boot the sound engine correctly. Re-launching the game usually fixes it.
Are you saying that you were on single-player, then?
I see.
Sorry to have wasted your time. I guess I should have taken into account that I was using Forge and stuff before posting on the official bug reporting site.
Would it help to say that I was on Bukkit? Also, I have Forge and Optifine installed in the Jar
So what you're saying is that it's intended that you hold an animal 2 meters off the ground for a few seconds, it dies as soon as it touches the ground, as if it fell from 20?