For some reason sql nav is not able to reverse the privileges that are associated with tables, views, users or any other database object.
The include grants preference is selected and the enable using DBA views is also selected at the logon screen.
**THIS IS A SHOW STOPPER FOR US. WE WILL NOT USE THE NEWER VERSIONS OF SQL NAV IF WE CAN NOT TRUST THIS FEATURE TO ALWAYS WORK.
**I am able to view the object privileges on other databases and database servers using the same sql navigator.
Please look into this.