You do not have the System.logon privilege in The PL/SQL Developer authorization

This indicates that somebody used the Authorization function as a DBA user, and has created an authorization table. Because it is probably empty now, nobody (except SYS) can use PL/SQL Developer. The customer will need to start PL/SQL Developer under the SYS account again, go to File > Authorization, and press the "Drop table" button. They can also grant the "All" privilege to "PUBLIC".

For more information, see chapter 22 in the User's Guide.
 
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