Users have the ability to view all relationships for a constituent via the Relationships tab on their record. Out of the box functionality allows for a details pane to pop up showing more detailed information about the relationship as well. Users are finding that in v3.0 Click Once that the details pane, when automatically showing, covers the actual relationship datalist making it impossible for users to see the list of relationships without closing the details pane.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.