I am using Oracle database 12.2.0.1 on IBM AIX. When running any expdp export, logged into a user with exp_full_database privilege, the export appears to complete, but hangs at the end rather then exiting. I have to explicitly kill the sessions. Session Wait shows "wait for unread message on broadcast channel". The problem does not occur during a schema export when logged into that user-ID. Full database stats have been executed on the database.