Mseberg And you working from long back with that issue, Great commitment.
When managing with Broker(DGMGRL) if any configuration changes are done, after all work around when its not succeeded.
I suggest you to Remove the database and configuration from dataguard broker and then add the databases again and further enable the configuration .
I had this kind of issue, But that issue related to Listener i guess, am not sure.. its story of long back.. after performing re-configuration it went fine.. So why can't you have a try? ;-)