I noticed that under the actions for a Workflow process, there is an action for Edit Team. I've tried it and I have a role that did not get assigned any users. It has no check boxes. Even though in the interface I can check off a user and click ok, nothing happens. When I go back in, it is still clear. What gives?
I noticed the same thing and I really have no idea why they still give you this option. The way to edit the team is under the Change Task window/Collaboration/Team. This will give you a list of your workflow roles with the users/groups assigned to each.