I'm using clusters to animate eyelids opening and closing. I make them, center the pivot point to the center of the eye, and parent the cluster to the geometry of the head. Everything works fine until I advance in the timeline and the head changes positions. The cluster still follows, but it rotates the eyelids around the initial starting point of where I made the clusters, but the rotate tool is in the middle of the eye still. Why isn't the cluster actually rotating where it should be anymore?
Ahh, found the solution. It turns out that I needed to delete history of the eyelid before creating a cluster. For some reason the history was making its own transformations.
So if anyone else has a problem similar to mine, then be sure to delete history if nothing else works! :)