Maya reference always locked?

[oopurple_hazeoo]

Hey I'm having some trouble with my maya referencing. I'm using maya 2010 on mac and every time i reference something into another scene it's locked and it wont let me unlock it in the reference editor?

It's a simple file with no layers and i try reference it into another scene and it just automatically locks it? all the move, rotate and scale tools turn grey also so i can't do anything with it?
Could anyone suggest anything???

[meetar]

Make sure you don't have any keys set on the channels you want to change in the referenced file. You can animate a channel in the referenced file or the referencing file, but not both.