When I try to check out a file from TFS I get the error TF14098: Access Denied User [username] needs PendChange permission(s) for [path].
I have added the user to the contributor group but it still won't let them check out a file.
Sometimes it may take a bit for the permissions to take synchronize.
http://msdn.microsoft.com/en-us/library/ms400712.aspx#doesnottake