I have a problem concerning survey permissions in different versions of limesurvey (2.06+, 2.50+).
To my understanding a user owning a survey should have the opportunity to add other users to a survey with different rights on the survey. But in my systems there is no way for a non-superuser to select any other users or user groups in the the servey permissions dialog. Both selection lists are always empty. Only the superadmin can modify the survey permissions. Additionally no user is shown on the survey permissions screen, even if the superuser has added other users to the survey permissions.