Peter, First thing, did you contact support with this question? If not, do that because they are the best way to get such questions addressed in a timely manner. Second, most likely this is a Team issue on the sourcing Library. You need to realize that the Sourcing Library is a Project Workspace similar to a Sourcing Full Project. You will want to access the sourcing Library, click "Detailed View" link in upper right hand corner. This changes the appearance to that which you are more familiar with project workspaces. If you can't see the Team tab, click on "Actions" in the Overview window, select "Full View". You will want to make sure that you are a team member and that you have a role as Active Team Member.