Steps to reproduce:
- Login as an admin
- Create a new workspace
- Hover over "Workspace" and click on "Administer Workspace"
- Click on "Workspace Users"
You should see the users listed the same as in the attached image (users.png). For example for the Admin user I think he should be listed simply as Administrator, without the "(xwiki:xwiki:Xwiki.Admin)" part.
Tested on Firefox 18 with the latest 4.5-snapshot.