So you're on the roster but your image is the old one. There's one of two things you can do. The first is to save your avatars as the same image file. I've noticed that people who keep the same image file type as their previous avatar, will have the avatar on the roster change.
Those of you that make a new avatar and it doesn't change, you can either try the above step, or just let me know below to update it.

Yeah uh it didn't change for me.