Switching Session Connections

I'm getting mulitple instances of switching sessions on 9.0.0.1601 and running program blocks which feedback that they have been successful yet they have not run in the correct schema.
If I launch a new instant of the client it works fine.
Is there an option in preferences that I am overlooking or is this a bug ?
 
Version 9.0 added support for multiple simultaneous connections, where each window or tool can have its own connection. If a Window is connected as user A, changing the PL/SQL Developer main (default) connection to user B will not affect this window. To change an individual Window connection, click on the connection name in the status bar of that Window and select a different connection or "Other".

To revert to 8.0 behavior, go to Tools > Preferences > Oracle / Connection and disable the "Allow multiple connections" option.
 
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