What is wrong with Animation Creator?

http://wiki.roblox.com/index.php?title=Animations

"Priority In your game you may have several different animations for player actions and states, but what happens when you want to start playing an animation when another is currently running? For instance, suppose you have a jump animation and an animation for when a character is standing still. To make the jump animation override the standing animation, priority should be used.

There are four levels of animation priority:

Core (lowest priority) Idle Movement Action (highest priority) If you start playing an animation with a higher priority than the one that was already playing, the new animation will supersede the old. You can set the priority in the editor while making an animation by clicking on the priority menu and selecting your desired level."