sdufour> Did you ever get a resolution to this? The forum has numerous posts about this issue from all the way back in 2004 to the present. It has apparently been present in 9i, 10g, and 11g, and has been present as far back as PL/SQL Developer 6.0. This really needs addressed by the PL/SQL Dev team.
Our issue is an exact duplicate of yours.
Thanks ~
James