I also had this problem this week with a project. I submitted a bug report. Like here, the assumption is s/r was not done - but that is not the problem. Something else is going on. In this case we were both using version 9.0.103.1.
Two days ago a consultant was doing remote support with a person and was trying to share a project but after multiple S/R, deleting and adding users on the admin side, the same thing happened. The user was able to do S/R of the project but the user menus did not match. Via the remote support session he confirmed that the user lists did not match… and did not give an error message on either machine that the list did not match the registry.
In both cases the person being added was being added as an administrator.