More on that: it looks that the problem appears if we switch the database connection in the middle of a PL/SQL Developer work session (using the tools Log on/log off in the Session menu).
Roque Daudt
We are randomly getting the ORA-01460 error when using PL/SQL developer with our UTF8 databases. They are 8.1.7 databases and we are already using PL/SQL Developer 5.1.2.682.
Any clue?
Roque Daudt